Feature:1. In order to make the quality stronger, we are constantly upgrading and improving, insisting on using better raw materials and technology to create stronger quality products, and achieving higher cost performance!2. The antidropping device can easily solve the problem that the sleeve cannot be fixed and is easy to detach from the bottom bracket and does not exert force. With it, novices can easily disassemble and assemble the axis bracket.3. There are precision and high compatibility square hole, spline axis shaft suitable for 20 keyways (downward compatible with 16 keyways), the longest compatible with 129mm shaft length bottom shaft.4. High degree of fit, straight square teeth, will not jump teeth, protect the bottom axis, precise and unified, 20 teeth synchronously fit, and force at the same time, fine turning.5. The tooth profile is improved and upgraded. In order to save costs, the general styles on the market will design the tooth profile into an inverted triangle. This will increase the torque of the tooth edge and reduce the force area to make the sleeve teeth more swift and easy to break. The keyway of the shaft is more easily damaged.Specification:Condition: 100% Brand New Item Type: Bottom Shaft Removal ToolMaterial: High Carbon Steel+Electroplating Heat TreatmentColor: SilverSleeve Weight: Approx.125g / 4.4ozAnti-Dropping Device Weight: Approx. 60g / 2.1oz.Package List:1 x Bottom Sleeve1 x Anti-Dropping DeviceNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.