The Evolution Standard U-lock by Kryptonite comes with a 14 mm hardened Kryptonium(TM) steel shackle and a highly resistant double deadbolt design. Together with a reinforced high-security disc-style cylinder that offers protection against drilling and picking, the lock&';s design ensures a high security level and easy handling. The lock comes with 3 stainless steel keys and one LED replaceable key fob, as well as with a FLEXFRAME-U bracket for comfortable transport. SPECIFICATIONS & FEATURES 14mm hardened MAX-PERFORMANCE STEEL SHACKLE 3 STAINLESS STEEL KEYS - including new key design and one LED REPLACEABLE KEY FOB Patent-pending HARDENED DOUBLE DEADBOLT design gives additional protection against twist attacks NEW SMALLER CROSSBAR DESIGN HIGHER SECURITY DISC-STYLE CYLINDER is pick and drill resistant Includes FLEXFRAME-U BRACKET providing convenient multi-location u-lock transport Protective vinyl coating Key Safe Program Product dimensions: 4" x 9" (10.2cm x 22.9cm) Product weight: 3.50 lbs (1.59 kgs)