13MM HARDENED MAX-PERFORMANCE STEEL SHACKLE resists bolt cutters and leverage attacks Patent-pending HARDENED DOUBLE DEADBOLT design gives additional protection against twist attacks NEW SLIDING DUSTCOVER NEW DOUBLE DEADBOLT DESIGN HIGHER SECURITY DISC-STYLE CYLINDER is pick and drill resistant. Includes FLEXFRAME-U BRACKET providing convenient multi-location u-lock transport 3 STAINLESS STEEL KEYS - including new key design and one LED REPLACEABLE KEY FOB Protective vinyl coating Key Safe Program Patent 6397648B1, 9079626B2, 9670698