Universal compatible for Honda/Yamaha/Suzuki/Kawasaki, the diameter of the round hole at the bottom is 12mm, Absorber shock promptly in the clumpiest road to improve security and make you feel more comfortable No instruction included, professional installation recommended. Installation type: Eye to Eye Fit on most 150cc~750cc Sport bikes and Dirt Bikes, Go-kart and Moped Quad Package included,One Pair Shock Absorbers, 2 x Wrench, 2 x Bushing Product Description Item Specific: Length of Eye to Eye Core: 340 mmfor choose Eye Diameter (with bushing): 12mm Eye Diameter (without bushing): 16mm Eye Thickness: 21mm Eye Maximum Tensile Strength: 2,000 Kgf Spring Thickness: 7mm Spring Width: 60mm Working Stroke: 60mm Spring Stiffness: 110 kg Maximum load: 200 kg (approx.440 lbs) Air Reservoir: Adjustable Factory Air Pressure: 0.4 Mpa Maximum Air Pressure: 0.5 Mpa Fitment: Universal fits most 150cc~750cc street bikes, Karting(Go kart), Scooters and Moped Quad (ATV) with shocks of eye to eye dist