16mm hardened MAX-PERFORMANCE STEEL SHACKLE. Patent-pending HARDENED DOUBLE DEADBOLT design gives additional protection against twist and cut attacks. HIGHEST SECURITY DISC-STYLE CYLINDER is pick and drill resistant. Sliding dustcover to PROTECT FROM DIRT AND DEBRIS. 3 STAINLESS STEEL KEYS - including new design and one LED REPLACEABLE KEY FOB. Includes FLEXFRAME-U BRACKET providing convenient multi-location u-lock transport. Key Safe Program. Protective vinyl coating. Product dimensions: 4” x 8” (10.2cm x 20.3cm). Product weight: 4.45 lbs (2.02 kgs).