Equipment Lock HDCDL-C Steel Heavy Duty Combination Cargo Door Lock Universal theft protection locks for trucks, trailers, containers and more Locks both doors of all storage containers and semi trailers Adjustable to fit the doors vertical bars From 9-3/4"-16" apart; an extension is available for containers with vertical bars 17"-21" apart Built with 2" and 2-1/2" square tube steel with 3/16" thick walls, end plates are 3/16" plate steel 6" tall Recommended for construction site storage An extension is available for the Heavy Duty Cargo Door Lock for odd size container bars 17-23 apart.