The Master Lock Laminated Steel Padlock features a 2 in. (51mm) wide laminated steel body for maximum strength and reliability. The 3/8 in. (10mm) diameter shackle is 1 in. (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. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.