Master Lock BLC0132DKA4 Commercial Cylindrical Keyed Entry Ball Knob Lockset, Satin Chrome Features Master Lock's exclusive bump stop advanced cylinder technology to protect against bump attacks Comes standard with 6 pin Schlage C cylinder Meets ANSI/BHMA A156.2, Series 4000 standards for entry sets UL listed, meets UL 3 hours fire rating Cylindrical lock housing