TOP QUALITY: Dri-Core drill made of a high-quality and tough steel body. The diamond-tipped edge is produced from synthetic diamond grit on teeth which provides exceptional performance at high speeds and effective cutting action SHARP CUTTING: These diamond drills will produce clean and accurate cuts with smooth surface finish, time and time again, and offer extended product life well beyond that of conventional tools. MINIMAL EFFORT: Every Starrett diamond core drill can be used to swiftly cut through the toughest materials with minimal effort i.e reducing user fatigue VERSATILE CORE: Our diamond core drills are perfect for drilling holes in non-metallics and offer the ideal cutting solution for the toughest situations in brick, masonry & more. FASTER & BETTER: Our Dri-Core Drills provide a faster rate of cut than Tungsten Carbide Tipped (TCT), with less pressure required USES: Our drills are suitable for plumbers, electricians and other installation engineers and an invaluable tool in the construction of flues, air vents and plumbing or electrical channels. KIT INCLUDES: This Diamond Dri-Core Drill holesaw kit includes five holesaws ranging in size from 38mm to 127mm, four arbors, and two accessories. The arbors and accessories included in the kit allow for drilling through a variety of materials.