Blue Boar diamond core bits from Lightsmith are engineered for rapid dry cutting in concrete block, cement roof tiles, and brick without the mess of water. Laser welding cutting segments hold up to high RPM use on right angle grinders. Sizes include pipe OD's of 2 5/8 in. and 3 5/8 in. Centering bit kits and rubber stabilizer squares for easier hole starting. Cut materials up to 10 in. thick and hole sizes 1 to 6 in., including pipe OD's of 2 5/8 and 3 5/8 in.