The Master Lock Boron Shackle Pro Series Padlock MLK6321 features a shrouded design that protects the shackles from bolt cutters. Its heavy steel body is capable of withstanding physical attacks, while the hardened boron alloy shackle provides maximum cut-resistance. The dual ball locking mechanism resists pulling and prying, and the 5-pin cylinder with spool pins is virtually impossible to pick. This padlock is ideal for securing valuable items and ensuring safety.