Progressively wound springs for a smooth,comfortable ride Adjustable spring preload,Includes necessary parts to service your bike??s shocks Made of steel quality,durable and strong Eye to Eye:320mm/12.59″,Fitment:Fit for most 150cc-750cc street bikes,Scooters and Moped Quad ATV Package Included:2x Shock absorber;2x Wrench;2xInstallation sleeve Specification: Material: Aluminum and solid steel Color: golden Specifications: paired Vehicle configuration: rear, left, right Installation hole distance: about 320mm Aperture: about 12mm Hole thickness: about 20mm Spring thickness: about 8mm Working stroke: 60mm Working pressure: 0.4 Mpa Maximum air pressure: 0.5 MPa Material: Aluminum and solid steel Color: golden Specifications: paired Vehicle configuration: rear, left, right Installation hole distance: about 320mm Aperture: about 12mm Hole thickness: about 20mm Spring thickness: about 8mm Working stroke: 60mm Working pressure: 0.4 Mpa Maximum air pressure