Hydraulic Door Closer, Exposed Installation. 1.37"L x 2.54"W x 7.02H. Commercial buildings, fire-rated doors, high-traffic areas, cold storage, freezers. Unique 3/4 adjustable offset hook automatically compensates for door sagging and aligns to the door frame in real time; comes with a pre-drilled tool kit (including 8 rust-proof screws) for easier installation. After rigorous laboratory testing, hydraulic door closer can withstand more than 600,000 openings and closings, with a lifespan of 6-7 years. It is designed for high-frequency commercial environments such as cold storage and ...