Bottom bracket: Material: alloy steel Color: syllable The length of the square hole: approx. 13.3mm The diameter of the cylinder: approx. 22mm Toothed bottom bracket round bore inner diameter: approx. 24mm Inner diameter of which teeth: approx. 24mm Outer diameter of the teeth: approx. 32mm Chain tool: Material: high-strength carbon steel + chrome Size: 7.8x7.8cm (T section size); 7cm(black section at both ends) Function: Quick disassembly and assembly of the chain, suitable for 5~10 speed chain Gear puller Material: metal + plastic Handle length: 29cm Chain length: 23cm Crank puller: Material: alloy steel Color: Black and silver Size: 8x2cm Scope of delivery: 5 in 1 bicycle tool set (crank puller + bottom bracket + bottom bracket + sprocket + chain riveter)