Features: 1. It is made of high-speed steel with titanium plating, which greatly improves the cutting performance of the drill bit, is more wear-resistant and prolongs the service life. 2. It ensures sharp, fast execution while maintaining strength and efficiency. 3. All cutting teeth are precision cnc machined and precisely heat treated for optimum thread performance. 4. The entry-level version is made of high- steel titanium-plated, suitable for tapping aluminum alloy center shaft threads; the professional version is made of high- steel titanium-plated cobalt, suitable for tapping aluminum, iron, and stainless steel bottom bracket threads. 5. Fine workmanship, school to prevent debris accumulation, more wear-resistant, longer service life. Notice: *Actual color may be slightly different from the image due to different Display and light effect *Please allow 1-3cm deviation due to manual measurement Description: Size: 35*25*18MM Package List: 1 pair x Bike Bottom Bracket Thread Tapping Tool