Material and durability - Constructed from quality aluminum alloy and stainless steel, the tool is strong, durable, and resistant to rust. This supports long-term use in regular maintenance without easy breakage. Bearing design for smooth operation - The bottom bracket tool uses a ball bearing design, providing stable, low-effort operation that helps protect the bicycle frame during use. Compatibility and function - Suitable for removing BB86, BB30, BB91, BB92, and PF30 press-fit center shafts. - Also suitable for installation of most hollow thread center shaft bearings, making it a versatile addition to a repair kit. Ease of use and correct alignment - To operate, hold the handle, check that the headstock or chassis is properly aligned, and select the appropriate wrench for manual adjustment. - It is recommended to install only one side at a time to ensure precision and minimize stress on the frame. Typical use scenarios - Home workshop or professional bike shop: removing and installing BB center shafts on bikes that use BB86, BB30, BB91, BB92, or PF30 standards, as well as hollow-thread center shaft bearings. - On-road or trail side repairs: quick field maintenance to address stuck or worn center bearings on compatible frames. - Routine maintenance: regular BB bearing servicing for bikes with compatible press-fit standards, helping to extend bearing life and maintain smooth operation.