Heavy-duty adjustable door closer with cover is size 1-6. ADA (Americans with Disabilities Act) performance and ANSI (American National Standards Institute)/ BHMA (Builders Hardware Manufacturers Association) 156.4 grade 1 (2 million cycles). UL (Underwriters' Labatories) and CUL (Underwriters' Laboratories of Canada) listed. TriStyle packed for regular, parallel, or top jamb mounts, adjustable backcheck, and closing and latching speed valves 5 year warranty with full cover. Housing length: 12-3/4". Mounting holes: 12" on center, 2 per side 3/4" on center. High frequency usage such as schools, hospitals, restaurants, and churches.