Master 6321KA Weather Tough Rekeyable Padlock. 2 1/8" wide laminated steel body with 5/16" diameter hardened boron alloy shackle. Cast iron shroud protects shackle from bolt cutters. Shackle opening measures 3/4" H x 7/8" W. Dual ball bearing locking. Rekeyable 5 pin 6000BK M18 keyway brass lock cylinder with spool pins making it difficult to pick. Padlock are keyed alike to 10G621 key. Includes 2 keys.