Master Lock 6270NKD Master Bump Proof Padlock, Keyed Different, Hidden Shackle Padlock "Van Door Lock" Heavy case hardened steel body and hardened steel lock body Shackle prevents forcible attacks by bolt cutters; Use with 770 hasp High Security, solid 6-pin cylinder; Keyed Different (KD), Random. Bump Proof Padlock Ideal for vans, trucks, gates, and vending machines