Deda 1 1/8 carbon spacer, this is compatible with 1 1/8 headsets (fork steerer outside diameter 28.6mm). 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 28.6mm, outside diameter 32mm. This is a genuine Deda accessory, made in a high modulus carbon fibre with a 3k woven external layer.