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. This heavy duty vertical cargo door lock is perfect for securing containers, especially those left on job sites. Box Size: 6" x 6" x 10" Made in the USA