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