A quality made part for strength and durability, Incorporating an adjustable spring Upper and lower bushings without screws, bushing length is 24mm, inner diameter of eye is 8mm Upgrade your ride with this Bike Rear Shock Absorber! this coil spring suspension delivers smooth performance for mountain bikes and e-bikes. for tackling rough trails with durable, soft-tail comfort! Bike shock absorbers make you more comfortable in the riding process Spring damping adaptive electric mountain bike is suitable for all kinds of off-road and daily riding environments. Enhance the rear wheel grip and shock absorption response, so that you can ride more safely and smoothly on complex roads.