Quantity: One Piece Color: Black Hole Distance: 162*19 Damping and ultra-quiet, simple installation and load-bearing 40-65 Opening less than 90 degrees will automatically close the door, opening more than 90 degrees will stop the door 1. Sprocket The sprocket is made of 20 teeth of chromium-manganese-titanium steel, which has good toughness, low temperature resistance, high fatigue resistance, stable quality and excellent mechanical properties. . Spring The spring is made of high-quality Jiameng material, which is often used in the manufacture of transmission gears in automobiles. It has good elasticity, high strength, low temperature resistance, and high fatigue resistance to prevent other springs from breaking. 3. Chassis Aluminum alloy die-casting, multi-process processing, regardless of the hole roughness or the center distance between the piston and the transmission shaft hole, etc., it can be effectively controlled, and the durability is strong and oily leakage is rejected. 5. Stable Rivets The rivet links are firm and durable and will not fall off Cast aluminum material Precision casting, permanent mold casting, durable and non-fading Thicken and bold Increases the service life of the door closer, not easy to break Firm and not easy to fall off With riveted links, you don't have to worry about loosening and falling off after a long time. Two-stage speed regulation The first stage adjusts the closing speed and the second stage adjusts the lock speed. Turn the valve clockwise to reduce the speed and counterclockwise to increase the speed. The speed control valve can only be adjusted by a small amount. Good quality product