Deda 1 18 carbon spacer this is compatible with 1 18 headsets fork steerer outside diameter 286mm place on above or below your stem for fine tuning the height of your handlebar available in black in 3 5 10 15 or 20mm inside diameter 286mm outside diameter 32mm this is a genuine deda accessory made in a high modulus carbon fibre with a 3k woven external layer