Custom Fiberglass & Plastic Locking Boxes Built for Your Application

Arrowhead Plastic Engineering designs and manufactures durable fiberglass and plastic locking containers for industrial, commercial, municipal, agricultural, and OEM applications. From weather-resistant dock boxes to custom equipment storage and secure package lockers, we engineer enclosures that protect what matters.

Custom Plastic and Fiberglass Lock Box, Square

Proven Locking Box Designs.
Custom Manufacturing Capabilities.

Rather than starting from scratch, Arrowhead has decades of experience producing molded fiberglass and thermoplastic locking containers for customers across multiple industries.

Whether you need a secure outdoor storage enclosure, truck-mounted storage box, equipment locker, or a completely custom design, our engineering team can adapt proven designs or develop a new solution around your requirements.

Built for Real-World Applications

Industrial & Fleet Storage

  • Truck-mounted storage
  • Chemicals
  • Fertilizer
  • Equipment
  • Maintenance supplies

Outdoor Storage

  • Dock boxes
  • Park equipment
  • Campgrounds
  • Recreation facilities
  • Municipal storage

Secure Delivery & Package Storage

  • After-hours deliveries
  • Package lockers
  • Commercial receiving
  • Jobsite deliveries

Agricultural & Animal Care

  • Feed storage
  • Seed storage
  • Farm tools
  • Horse trailers
  • Livestock equipment

Recreational Storage

  • Dock boxes
  • Ski equipment
  • Bikes
  • Scooters & Mopeds
  • Jet ski accessories

Wildlife Resistant Storage

  • Garbage containment
  • Campgrounds
  • Cabins
  • National parks
  • Bear-resistant applications

Featured Locking Box Designs

Dock & Recreation Boxes

Fiberglass Drop Box

Arrowhead’s fiberglass dock and recreation boxes provide secure storage for outdoor equipment, tools, feed, supplies, and recreational gear. Their rugged fiberglass construction is made for years of outdoor use. Choose from several proven sizes and designs for marinas, parks, farms, trailers, commercial sites, and more.

These boxes are available in marine-grade white or black. Custom colors are also available when minimum order quantities are met.

Rectangular: 50″ Long x 27″ Wide x 33″ High
Triangular: 61″ Back x 46″ Sides x 34″ High
Ski Box: 75″ Long x 23.5″ Wide x 21″ High

Clamshell Style Dri-Boxes

Dri-Boxes feature a clamshell design that provides wide, easy access to the storage area. These rugged boxes are well suited for trucks, trailers, equipment, outdoor storage, and other applications where contents need to stay protected and secure.

Locking Black Clamshell Box

Small Dri-Box™ Plastic Storage Container

The Dri-Box™ is a rugged storage box built for trucks, trailers, and commercial vehicles. Its clamshell design makes loading easy, while gas struts hold the lid open during use.

A weather-tight seal, stainless steel hardware, and lockable latch help protect tools, supplies, and equipment from the elements. Available in fiberglass or TPO plastic, the Dri-Box is a dependable storage solution for landscaping, agriculture, utilities, and fleet applications.

Small Dri-Box: 36″ Wide x 23″ Deep x 27″ High

Large Fiberglass Dri-Box™ Storage Container

The Large Dri-Box provides more room for tools, equipment, feed, supplies, and other bulky items. It is made from fiberglass using a vacuum bag molding process. This creates a smooth finish on both the outside and inside of the box. The Large Dri-Box is available in marine-grade white or black. Custom colors may be available when minimum order quantities are met.

Large Dri-Box: 60″ Wide x 40″ Deep x 35″ High

Corner Fiberglass Storage Boxes

Triangle Locking Dock Box

Triangular Corner Box

Make better use of corners and tight spaces with a fiberglass storage box designed to fit where standard rectangular boxes may not. This triangular design provides secure storage while taking advantage of otherwise unused space. It works well for docks, marinas, recreational areas, commercial sites, and other outdoor applications.

The Corner Fiberglass Storage Box is available in marine-grade white or black. Custom colors are also available when minimum order quantities are met.

Corner Fiberglass Storage Box: 61″ Back x 46″ Sides x 34″ High

Customize Your Containers

Need a different size or design? Arrowhead can produce custom fiberglass and plastic locking boxes to fit your application. Custom sizes, materials, colors, hardware, and other features are available. Tooling or setup charges and minimum order quantities may apply depending on the project.

We Can Build

  • Fiberglass locking boxes
  • Plastic locking boxes
  • Large equipment enclosures
  • Truck-mounted storage
  • Custom molded containers
  • Dock boxes
  • Utility boxes
  • Delivery lockers
  • Specialty storage products

Customization Options

  • Size
  • Material
  • Color
  • Hardware
  • Locking mechanisms
  • Mounting features
  • Internal organization
  • Logos
  • Gel coat colors
  • Branding panels

Why Work with Arrowhead?

50+ Years of Manufacturing Experience

50+ Years of Manufacturing Experience

Custom Production
Solutions

Custom Production
Solutions

Prototype to Production Support

Proven
Box Designs

U.S.-Based Manufacturing

U.S.-Based
Manufacturing

Need a Secure Storage Solution?

Whether you need a proven locking box design or a completely custom fiberglass or plastic enclosure, Arrowhead Plastic Engineering can help you develop a durable storage solution built for your application.

Frequently Asked Questions About Arrowhead Locking Containers and Boxes

What types of locking boxes does Arrowhead manufacture?

Arrowhead manufactures custom fiberglass and plastic locking boxes for a wide range of applications. Our proven designs include truck-mounted storage boxes, dock boxes, utility boxes, equipment storage, delivery boxes, and custom enclosures built to meet your exact requirements.

Yes. Arrowhead can manufacture custom-sized locking boxes in fiberglass or plastic. We can modify an existing design or develop a new solution for your application. Tooling or setup charges and minimum order quantities may apply.

We manufacture locking boxes in fiberglass and thermoplastic materials, including TPO. Our engineering team can recommend the best material based on your application, environment, and durability requirements.

Yes. Our locking boxes are designed for outdoor use and feature weather-resistant materials, durable construction, and seals that help protect the contents from rain, dirt, and the elements.

Absolutely. Our boxes are designed with secure locking mechanisms that accommodate padlocks or other locking hardware, helping protect tools, equipment, supplies, and other valuable contents.

Our locking boxes are used across many industries, including landscaping, agriculture, utilities, municipalities, construction, transportation, marinas, parks and recreation, fleet management, and commercial facilities. They can also be adapted for recreational and residential applications.

Yes. Many of our locking boxes are designed for truck, trailer, and fleet applications. We can also engineer mounting features for specialized equipment or custom installations.

Yes. Our fiberglass boxes are available in marine-grade white or black, and the Small Plastic Dri-Box is currently available in black. Custom colors may be available when minimum order quantities are met. Branding and graphics can also be added to many box designs.

Yes. Depending on the application, we can incorporate dividers, mounting brackets, inserts, compartments, or other custom interior features to better organize and protect your equipment.

Yes. Arrowhead works with OEMs to develop proprietary storage boxes and enclosures for commercial products, vehicles, and equipment. We support projects from concept and prototyping through full-scale production.

Yes. Many of our products were developed for a specific customer but have proven to be highly adaptable. They can be used for tool storage, feed storage, package delivery, outdoor equipment, recreational gear, commercial supplies, and many other applications.

Minimum order quantities vary depending on the product and whether an existing mold can be used or a new tool is required. Contact us to discuss your project, and we’ll recommend the most cost-effective manufacturing approach.