Heavy duty, UL certified, Grade 2. 6 Pin solid brass tumbler cylinder; 5 pins keyed to Schlage (SC4) keyway. Cylinder removable for rekeying. Fits wood or metal doors from 1-3/8" to 1-3/4" thick. Meets ANSI Specifications. Re-keyable will accept the following cylindrs: SCHLAGE, ARROW, MARKS, AWI, LORI, FALCON, ASSA, & most MEDECO.