Description: Made of aluminum alloy material, durable, which can be used for a long time. Adjuster Size: The inner diameter is about 29mm/1.14inch, and the thickness is about 6.3mm/0.25inch. Purpose: Spare Part Kit for adjusting the axial bearing clearance of DUB cranks. Preload Ring Kit for DUB Crank. It adopts anodizing treatment, which is not easy to fade. Specification: Material: Aluminum Alloy, Nylon Size Chart: Inner diameter: approx. 29mm/1.14inch thickness: approx. 6.3mm/0.25inch Package Includes: 1 Piece Adjustment Screw 1 Piece Nylon Screw Washer Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you 3. Wish you a wonderful on-line shopping