Description: Model: BC 1.37x24T tap for making bottom bracket threads or repairing bottom bracket threadsThe thread repair tap is made of high speed steel titanium plated, which greatly improves the cutting performance of the drillThe entry level version is made of high speed steel + titanium plated, suitable for tapping aluminum alloy center shaft threads; the professional version is made of high speed steel + titanium plated + cobalt, suitable for tapping aluminum, iron, and stainless steel bottom bracket threadsFine workmanship, school to prevent debris accumulation, more wear resistant, longer service lifeIt ensures fast, quick execution while maintaining strength and efficiency Specification: Color: yellow/blackMaterial: Steel, titaniumSize(LxWH): Approx.35x35x25mm/1.38x1.38x0.98inchInner diameter: 18mm/0.71inch Package Includes: 2 Pieces Repair Taps Only(without tools) Note: 1. Please allow slightly error due to manual measurement.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Wish you a wonderful on line shopping!