The Kryptonite KryptoLok Combination U-Lock is made of a high-grade hardened carbon alloy steel construction. This lock's shackle resists hand tools with force, while the four-digit combination simplifies things by eliminating the possibility of losing keys. Its centrally-located mechanism helps defend against leverage attacks, while the bumpers reduce rattling noise when you're transporting the KryptoLok from spot to spot.
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