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Arrow Lock DC300 Series surface applied door closers are an economical value for customers requiring convenience and security in an affordable package. They are ideally suited for retail or office buildings. Cast aluminum body. Hardened steel rack and pinion. High tensile steel springs. Staked valves. Two non-critical adjusting valves (sweep and latch) control closing speed. Back check intensity valve. All temperature fluid. Full plastic cover available (sold separately). Non-handed for regular, top jamb and parallel arm mount applications. Supplied with fully threaded wood screws, machine screws and thru-bolts for 1-3/4-inches thick doors. Closers are adjustable for spring sizes 1 through 4. 10 Year limited warranty. Aluminum finish. Certification: UL/cUL listed. UL10C listed for positive pressure to comply with UBC-72 (1997). Meets the requirements of ANSI A156.4. Adjustable size closers may be adjusted to meet requirements of ADA and ANSI ICC A117.1. Meets ADA requirements (Americans with Disabilities Act). BHMA Certified.