Specifications: Made of aluminium alloy and stainless steel, it is very durable. This product has a wide range of use and versatility It can be used for the installation and removal of the central shaft and bike headset and bottom bracket installation. Item Name: Bracket Installation Kit Material: Aluminum Alloy, Stainless Steel Features: Durable, Widely Compatible, Installation Kit Size: 26cm x 24.5cm/10.24" x 9.65" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. If the extent of chain wear reaches 0.5 percent to 0.75 percent, which means the chain works normally. If the extent of chain wear reaches 1.0 percent, which means the chain need to be replaced. Package Includes: 1 Set Bracket Installation Tool