Description: Made of steel material, very durable. Small,easy to use and carry. This bike crank extractor remover can be used with a 24mm wrench or adjustable spanner. Suitable for any 20 Teeth splined type bottom bracket. A necessity small tool for repairing bicycles. Specification: Material: Steel Inner diameter: approx. 25mm/0.98 inch Teeth Bottom Dia.: approx. 27 mm/1.06 inch Teeth Top Dia.: approx. 32 mm/1.26 inch Package Includes: 1 Piece Bottom Bracket Repair Tool Note: 1. The above size is measured by hand, please allow 1-3 mm error due to manual measurement. 2. Color might be slightly different due to the color calibration of each individual monitor