*Cylinder lock and 2 Random keys *3 OE-inch h x 3 oe-inch diameter lock *Covers semi-trailers' king pins *Prevents theft of dropped-off trailers *Prevents unauthorized coupling *Indestructible cast iron body *"Cup" design keeps grease off hands *Prohibiting 5th wheel from engaging king pin Height - 3.10 Inches Width - 4 Inches Length - 5.00 Inches