... : 25x23, 24x22.5, 21x10,20x10,16x8, 13x6 4)High quality Gas Spring Orienting SleeveISO9001: 2000Outside Diameter: ¢25×23, ¢24× 22.5 ... , ¢13× 6Concave- convax guide sleeveMaterial: nylonMany types are available for gas springs, hydraulic dampers and shock absorbers.Others: Gas Spring Plastic Orienting Sleeve