Pro Bit Driver - JIS PH #1, JIS PH #2, 5mm Flat Blade 6 pack chain tool 8mm internal diameter with 21

8mm internal diameter with 21

and better alignment

Fits 16-notch X 41mm diameter external bearing bottom bracket cups

Ideal coverage of less common large hex sizes

Pro Bit Driver - JIS PH #1, JIS PH #2, 5mm Flat Blade 6 pack chain tool 8mm internal diameter with 21Precision Bit Driver With Screwdriver Bits Ergonomic machined aluminum body with bearing mounted rotating cap for precision and control. Magnetic bit drive accepts any standard hex bit. Internal storage for two bits. Also compatible with Multi Torque Bit Set. Includes JIS compatible PH#1, JIS compatible PH#2, and 5mm Flat Blade bits. Designed for speed, precision, control, and versatility the Pro Bit Driver is ideally suited to assembly and tuning,