The steel braces of the WorkSafe USA Dump-Lok DL105 dump truck and dump trailer safety support device, lock a truck's dump bed in the raised position, preventing it from falling in cases of system failure or operator error. Dump-Lok can be used universally on any brand of dump box. Dump-Lok No. DL105 steel braces fit up to a 4.5" flange - the standard dump truck flange is 3.5". Dump-Lok is designed with easy to grip handles, making each steel brace easy to carry and easy to install between the truck frame and dump box.