These Cane Creek Integrated Headset Shims are used to adjust the depth of the machined head tube in order to ensure a correct fit for most Integrated System headsets. It is recommended for use between top cover and compression ring to prevent the top cover from coming into contact with the top of the head tube. This set of ten spacers has a thickness of a quarter millimeter and an inner diameter of 1-1/8″.Specifications:ID: 1-1/8″Thickness: 0.25 or 0.50mmColor: SilverSOLD INDIVIDUALLY