The Master Lock No. 7D Laminated Padlock features a 1-1/8” (29 mm) wide laminated steel body for maximum strength and reliability. The 3/16” (5 mm) diameter shackle is 9/16” (14 mm) long and made of steel for resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering.