High security padlock, for general use with commercially available hasps or heavy duty chains which accept 13mm sliding bolts. Ideal for applications requiring high bolt protection. Mul-T-Lock unique high precision 10 telescopic pin tumbler system. Pick and drill resistant for high security needs. Protective shutter to prevent dust contamination. Unlocking with 55° key rotation. Spring loaded bolt release. Also known as Shutter lock or Anvil padlock.