Feature:1. Double Plane Thrust Bearings: The headset bottom bracket press tool has double sided plane thrust bearings, which are designed for labor saving installation, the bearings use lubricated balls for labor saving operation and are not easy to be crooked.2. Bottom Bracket Installation: When installing the press in bottom bracket, adjust the position of the press block to the opposite side, hold it with both hands and slowly apply pressure to install it. At the same time, pay attention to whether the headset or bottom bracket is tilted to avoid crushing the bearing during installation.3. Screw Rod: Longer galvanized screw rod with galvanized surface and tight thread pitch, which has high strength, and suitable for most head tube lengths.4. CNC Aluminum Alloy: Full CNC aluminum alloy handle and joints with lightweight design and fine threads. The connector is CNC exquisitely turned and electroplated, the handle is detachable, exquisitely knurled, and the surface is anodized.5. Press Block Design: The back side of the press block is used to assemble the press in bottom bracket. The sinking platform is designed to drive into the air to avoid crushing the bearing during installation. The front side corresponds to the inner hole size of frame head tube or the wrist group. Multiple sizes are applicable (52mm/46.9mm/44mm/41mm/34mm), which can be nested in the outer cup of the headset for press in operation, which serves as a guide during assembly to position, not easy to be crooked, protect frame and headset. It can be used to install most common headsets on the market and some press in bottom brackets.Specification:Item Type: Headset Cup BB Install ToolMaterial: Aluminium Alloy Main BodyProduct Size: 265x197mm / 10.4x7.8in (after installation)Product Weight: Approx. 532g / 18.8oz.Package List:1 x Screw Joint Main Part2 x Press Block2 x HandleNote:Please allow 1‑2cm error due to manual measurement. Thanks for your understanding.