Contractor Quality. Fits Robertson Screws. Machined from high quality chrome vanandium molybdenum tool steel. 60.33 average Rockwell hardness. Available in bit sizes #1, #2 and #3 with a 2" length.
Bit Insert, Square Drive #1, 2" L 1/4" Shank
Bit Insert, Square Drive #2, 2" L 1/4" Shank
Bit Insert, Square Drive #3, 2" L 1/4" Shank