Features: 1.High Strength Material: Made of high strength steel and high performance spring, which is compression resistance, deformation proof, strong pressure resistance. 2.Function: Provide smoother driving and better overall damping management, improve driving comfort, motorcycle handling and driving safety. 3.Adjustable Spring: The suspension shock damper with adjustable spring, can adjust the strength that suits you best, to deal with different road conditions. 4.Dimensions: Mounting hole diameter approximate 10mm/0.39in, hole center distance approximate 250mm/ 9.84in, spring diameter approximate 7mm/0.28in. 5.Application: Suitable for 50cc?125cc Dirt Pit Bike ATV Go kart, universal fit for all 250mm hole center mounted moped ATVs and more. Specification: Item Type: Shock Absorber Material: Steel alloy, high performance spring Mounting Hole Diameter: Approx. 10mm/0.39in Hole Center Distance: Approx. 250mm/ 9.84in Spring Diameter: Approx. 7mm/0.28in Mounting Hole Thickness: Approx. 20mm/0.79in Overall Length: Approx. 280mm/11.02in Function: Can be adjusted in 5 gears, you can adjust it according to your own load Application: Modification, replacement, repair, refurbishment, decoration, upgrade, to replace the old and damaged shock absorbers of the original car, improve the shock absorption performance Fitment: Suitable for 50cc ?125cc Dirt Pit Bike ATV Go kart, universal fit for all 250mm hole center mounted moped ATVs and more Note: When adjusting the spring, be sure to use adjustment tools, otherwise it is easy to cause finger hurt