"RACK : Our high quality Rack is made jointly over the piston; the piston is machined on one side with the help of milling cutter to make the rack on the piston. PINION : Our Pinion is basically a gear on which the rack moves. This pinion is placed on the side nuts and serves the platform for the hydraulic mechanism of the closer. Our high quality Cast Iron or steel aluminium alloy is highly durable"