BISupply 1-3/8-Inch Diamond Tile Circle Cutter Diamond Bit Drill Core Bit Arbor is perfect for tile installers, plumbers, construction workers, and average DIYers. Easily create holes or cut out templates with these core bore drill diamond bits for drilling machine. 0.8-inch long shank with internal 5/8-inch x 11 thread works with your angle grinder or drill adapters. Make renovating your kitchen countertops, basement walls, or bathroom tile easier by using a diamond glass drill bit that can cut through concrete, granite, marble, masonry stone, brick, and other non-reinforced materials. Hole drill bit features diamond crusted cutting segments and cutout sides for fast cutting. Highly recommended to wet cutting surface to control temperature and to prolong bit life. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.