Proto® J4990-4MST Standard Length Socket Bit, Metric, 4 mm Bit, 3/8 in Square Drive, 17.5 mm
Proto® Socket Bit, Standard Length, Measurement System Metric, 3/8 in Drive, Square Drive, 4 mm Bit, Hex Bit, 17.5 mm Bit Length, 45.2 mm Overall Length, 6 Points, Forged Alloy Steel, Nickel Chrome Plated
- 2 piece design
- Replaceable bit
- Set screw holds bit