High quality diamonds ensure fast drilling and long life. Diamond segment bond developed exclusively for UK building materials. Spiral barrel design increases dust removal and helps to prevent snagging. ½" female thread accepts all makes of dry core accessories. Slotted barrel enhances dust removal and aids release of drilled material.Ideal for hand basin waste, overflow, shower and bath waste pipe, tumble dryer vents and boiler flues. Dry Use Only Steel Slotted Spiral Barrel Enhances Dust Removal For Use with SDS Plus Drills - Use with a Pilot Drill Diamond Segments High Quality Diamonds for Fast Drilling & Long Life Developed Exclusively for UK Building Materials Dry Use Only Steel Slotted Spiral Barrel Enhances Dust Removal For Use with SDS Plus Drills - Use with a Pilot Drill Diamond Segments High Quality Diamonds for Fast Drilling & Long Life Developed Exclusively for UK Building Materials