Adjustable door closer size 3-6 is certified ANSI (American National Standards Institute)/BHMA (Builders Hardware Manufacturers Association) 156.4 grade 1 (2 million cycles). UL Underwriters' Laboratories) and CUL (Underwriters' Laboratories of Canada) listed. TriStyle packed for regular, parallel, or top jamb mounts, adjustable backcheck, and closing and latching speed valves with 10 year warranty. Meets Buy American Act. Housing length: 9-3/4", 2-7/8" projection from mounting surface, 2-5/8" wide. Mounting holes: 9-1/16" on center, 2 on each side 3/4" on center. Can be used on doors up to 48" wide.