Master 21KZW1 Rekeyable Padlock. 1 3/4" wide laminated steel body with 5/16" diameter hardened steel shackle. 15/16" shackle clearance. Dual ball bearing locking. Rekeyable 4 pin 1K M1 keyway brass lock cylinder. Plastic body bumper. 0 bitted. Includes 2 key blanks.