【Professional Design】 The bottom bracket wrench has stable characteristics and high reliability, specially designed for removing hollow bottom bracket housings on mountain bikes and road bikes. 【Material】 The bicycle bottom bracket wrench is made of upgraded aluminum alloy, which provides high hardness, strength, durability, and long service life. 【Common Type】 Our bottom bracket wrenches are suitable for most bottom bracket types on the market, generally the type used on all bikes with the series. 【Closed Loop】 This wrench uses a closed-loop design, so you don't have to worry about deformation when opening. The straight tooth design provides a high degree of engagement. 【Fine Finish】 Thanks to the precise thread cutting, glazing, and polishing process, the bicycle wrench is firmly engaged during use, and the teeth are not easy to slip, which effectively protects the bottom bracket. Professional design: The bottom bracket wrench has stable characteristics and high reliability, specially designed for removing hollow bottom brackets on mountain bikes and road bikes. Material: The bicycle bottom bracket wrench is made of upgraded aluminum alloy, which is of high hardness, strong and durable, with a long service life. Common type: Our bottom bracket wrenches are suitable for most types of bottom brackets on the market, generally the type used for all bikes with the PROWHEEL 1 series. BB44: This is the most common type of wrench. Most bottom brackets on the market of this specification: For BB51 / BB52 / BB70 / BB71 / RS500 / MT500; For SRAM GXP series; For PROWHEEL series support bolt; For IXF series; And most bottom brackets with 44mm outer diameter available on the market; 2. BB46; For the special SRAM DUB threaded bottom bracket wrench. Features: Closed-loop design prevents opening deformation; high utilization rate of the flat and straight tooth-shaped bit; High-strength aluminum alloy material - high hardness; Tight fit, not easy to slip; Brushed and polished aluminum alloy; Precision thread cutting; No damage to the center axle