Specifications:Material: Anodized AluminumInside Diameter: 8/10/12/14/16/18/20/22/25/28/30/35/40mmColor: BlackCNC aluminum non-threaded spacer with steel socket head bolts and locking nuts.ID 8mm Tube clamp: Installation hole distance is 14mm, equipped with M3 * 25mm anti-skid screws and nuts, with a width of 20mm, a height of 14mm, a thickness of 5mm, and a weight of 3.6g.ID 10mm Tube clamp: Installation hole distance is 16mm, equipped with M3 * 25mm anti-skid screws and nuts, with a width of 22mm, a height of 17mm, a thickness of 5mm, and a weight of 3.8g.ID 12mm Tube clamp: Installation hole distance is 18mm, equipped with M3 * 25mm anti-skid screws and nuts, with a width of 24mm, a height of 19mm, a thickness of 5mm, and a weight of 4g.ID 14mm Tube clamp: Installation hole distance is 20mm, equipped with M2.6 * 30mm anti-skid screws and nuts, with a width of 21mm, a height of 26mm, a thickness of 5mm, and a weight of 4.4g.ID 16mm Tube clamp: Installation hole distance is 22mm, equipped with M3 * 30mm anti-skid screws and nuts, with a width of 28mm, a height of 23mm, a thickness of 5mm, and a weight of 4.7g.ID 18mm Tube clamp: Installation hole distance is 24mm, equipped with M3 * 35mm anti-skid screws and nuts, with a width of 30mm, a height of 25mm, a thickness of 5mm, and a weight of 5.1g.ID 20mm Tube clamp: Installation hole distance is 26mm, equipped with M3 * 35mm anti-skid screws and nuts, with a width of 32mm, a height of 27mm, a thickness of 5mm, and a weight of 6g.ID 22mm Tube clamp: Installation hole distance is 28mm, equipped with M3 * 40mm anti-skid screws and nuts, with a width of 34mm, a height of 29mm, a thickness of 5mm, and a weight of 6.6g.ID 25mm Tube clamp: Installation hole distance is 31mm, equipped with M3 * 40mm anti-skid screws and nuts, with a width of 37mm, a height of 32mm, a thickness of 5mm, and a weight of 7.7g.ID 28mm Tube clamp: Installation hole distance is 34mm, equipped with M3 * 40mm anti-skid screws and nuts, with a width of