Reference Size: Eye Center to Center Distance is about 215mm/8.46inch. Mounting Hole Diameter is about 8mm/0.31inch. For 2 Stroke: This 215mm shock damper spring is suitable for 2 stroke quads, buggies, some pit bikes, mountain bike, bicycle, folding bike and more. High Quality Material: This shock absorber is made of high-quality steel material, precision parts, sturdy and durable. Main Function: Shock Adjustable Damper, shock strut has anti-oxidation and wear resistance, adjustable spring pressure, and a maximum load acity of 2000lbs, which can be improved according to your own riding experience to meet your needs on modified vehicles. Easy to Install: Shock Absorber overall replacement parts are easy to install without any modification or drilling, easy to use, original worn shock absorber can be removed and installed directly, saving your time and energy.