6PCS HSS INCH HEX SHANK COMBINATION DRILL BITS TAP COUNTERSINK SET (SILVER)

Features:
- Complete hole drilling, tapping, and countersinking in one operation with power drill saves labor and time
- Back tapered beyond tap to prevent thread damage from over-drilling
- Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency
- Applicable to some types of carbon steel and ordinary steel, copper and aluminum magnesium alloy drilling hole
- Made of hardened high-speed steel material, compared to carbon steel for a longer life
- Size include: Diameter 1 / 8 inches, 5 / 32 inches, 3 / 16 inches, 1 / 4 inches, 5 / 16 inches, 3 / 8 inches