The Master Lock No. 5D Laminated Padlock features a 2in (51mm) wide laminated steel body for maximum strength and reliability. The 3/8in (10mm) diameter shackle is 1in (25mm) long and made of hardened boron alloy, offering maximum resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering.