The new MT5 features not only a double-sided flat key but also 3 active locking mechanisms: - The locking bar mechanism is one of the three technologies featured in the MT5 . Correct alignment of the top bar pins depends upon the correct combination key being inserted. - The new -generation product is also based on a new configuration of Mul-t-lock's well-honed telescopic pin technology. - The tip of the key has a revolutionary mobile interacting spring - the Alpha Spring. The Alpha Spring engages a unique pin at the rear of the mechanism, creating another shearline. All MT5 products have a double-sided unique MT5 key. One set of cuts is for the telescopic pin mechanism and the other cut, the milled pattern, is for the locking bar. The combination provides enhanced key security and higher manipulation resistance. Application: Extra high security padlock, for general use Material: Steel body, Hardened Boron Steel Shackle. Cylinder Mechanism: Mul-t-lock unique, high precision telescopic pin tumbler system.