Premier Lock carries a full line of solid brass mortise cylinders for all of your residential and commercial door needs. If you order multiple quantity of this single listing, each cylinder will be keyed different. If you need to order more than 1 cylinder that open with the same key (keyed alike), please visit our keyed alike multi-pack listings. This 1-1/4 in. cylinder is compatible with Premier Lock Mortise Locksets (MR01, ML01, MR01N, ML01N, MR01D, ML01D, MR01R, ML01R, MR02, ML02, MR02, ML03, MR03D, ML03D and other brands with standard mortise locks) for doors thicker than 1-3/4 in. Also compatible with panic devices in commercial applications that require a mortise cylinder.