The master lock 1178d pro series 4 digit padlock has a strong and durable die cast zinc body with octagonal boron carbide alloy shackle gives the lock superior protection against forced removal by cutting the resettable 4 digit lock has the possibility of over 10000 combinations and the deadlocking mechanism protects against prying shimming and rap attacks the combination dials are extremely easy to use thanks to master locks unique blind system theyre easy to turn even when youre using gloves o