Double security with oversized hardened steel sleeve, double deadbolt and high-security disc-style cylinderSliding dust cover protects and extends the life of the cylinderOversized hardened steel sleeve over the crossbar for enhanced securityFeature a protective vinyl coatingInclude three stainless steel (I) keys, one of which is lighted with a high-intensity bulb and replacement batteryPART #4010-0193 features an 18mm hardened MAX-Performance steel shackle and PART #s 4010-0195 and 4010-0270 feature a 16mm hardened MAX-Performance steel shackle to resist leverage attacks and bolt cutters