Bottom Bracket Feature： 【Shell width】Fit frames with 68/73mm bottom bracket shells 【Thread】BC1.37-inch*24T L/R Threaded Connection design enhance lateral stability to avoid creaking sound. 【Material】BUCKLOS BSA Bottom Bracket characterize cold-forged machined aluminum alloy cups, dual-labyrinth bearing covers and precision sealed bearings, weight about 74.7g. 【Application】Designed for road bike, they are perfect match 29mm crank spindle. Wrench Tool Feature： 【CNC Process】7075 GB aluminium alloy CNC engraving and milling, anodic oxidation, super durable and light weight, high strength, strong, neither deforms easily nor scratches the axle. It can be reused. 【Size&Weight】Approx. 19.5 * 6.3cm / 7.6 * 2.5inch, weight about 83.6g / 0.18lb. 【Professional Repair Tool】Professional tool designed s.