Application: Extra high security padlock, for general use with Mul-t-lock high security hasps or any other suitable hasps. Operation:Unlocking with 55° - 65° key rotation and is key retaining. Material: Hardened Steel Shell, Black Plated Solid Brass Core and Hardened Boron Alloy Steel Shackle. Additional features: Protective shutter prevents dust contamination. Drainage holes prevent freezing. Cylinder Mechanism: Mul-t-lock unique, high precision telescopic pin tumbler system. Pick and drill resistant for high security needs Meets CEN & ISI standards