18mm hardened MAX-PERFORMANCE STEEL SHACKLE resists bolt cutters and leverage attacks - Oversized, patented HARDENED STEEL SLEEVE over crossbar for double security - DOUBLE DEADBOLT locking for extensive holding power - HIGH SECURITY DISC-STYLE CYLINDER - Center keyway defends against leverage attacks - Protective vinyl coating - SLIDING DUSTCOVER protects and extends cylinder life - 3 STAINLESS STEEL KEYS - one lighted with high intensity - LED BULB & REPLACEABLE BATTERY Key Safe Program - Lifetime Warranty