Pneumatic Hydraulic Shock Absorber AD2525 Stroke: 25mm Dia Thread: 25mm Shock absorber is adopter special structruedesign. It converses the kinetic energy to heat energy, and then discharge the heat energy into the air. It is an idealproduct of both absorbing shock energt and making the optimum soft stop. It plays a key part of ruducing machines #39; wearing away. Lightening maintaining time, extending using time. Features amp; details Adjustable Stroke: 25mm 25mm Dia Thread Thread 25M x 1.5