Designed to be used with any "E" or "A" style logistic track with 2" x 4" or 2" x 6" commercial grade Douglas Fir lumber. Often used to replace load locks or metal E beams for many applications inside trailers. Made from heavy duty zinc plated steel with spring loaded latching trigger and locking design. Great for Commercial truck trailers, Utility Trailers, Enclosed Trailers, Ocean Shipping Containers, Farm and Nursery shipping applications, Moving and Storage Trailers and many more uses.