Description: 【Metal Material】This PPR pipe mouth drill bit is made of bearing steel and coated with titanium, sturdy structure 【Function】Countersink Drill Bit is specifically designed for PPR pipe repair and hole expansion, making your work more efficient and effective. 【Hexagonal Handle for Stability】The hexagonal handle with 1/4” Hex Shank distributes force, ensuring good compatibility and stability. It prevents easy slippage or deviation, resulting in smooth pipe mouths. 【Low Cutting Resistance】Pipe Repair Drill Tool features low cutting resistance which facilitates drill/expansion/shaving tasks, making your work easier and faster. 【Professional Accessories】Countersink Drill Bit with 1/4” Hex Shank suitable for electric drill and electric wrench Size Chart: 24 31: total length 60.8mm, working length 38mm, handle width 6.35mm 18 24: total length 59.5mm, working length 37mm, handle width 6.35mm 15 19: total length 59.5mm, working length 37mm, handle width 6.35mm Package Includes: 1 Drill Bit(6 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.