StackRight Headset Spacers look great and stay that way! No more misaligned headset spacers thanks to the StackRight technology, which locks spacers together with an interlocking channel for a clean, sleek look.Fits 1-1/8" threadless fork steererInner Diameter: 28.9mmOuter Diameter: 34.4mmPrecision-machined 6061 aluminumKit includes 1.5mm (2), 2.5mm (2), 5mm (1) and 10mm (2) thicknessesItem SpecificationsColorRedDefined ColorRedMaterial6061 AluminumS.H.I.S. Stem Clamp Diameter28.6Thickness1.5Thickness10Thickness2.5Thickness5 Wheels Manufacturing StackRight Headset Spacer Kit Headset Stack Spacer UPC: 811079029775