CORTOOL Diamond Drill Bits for Porcelain Tile Ceramic Glass Granite Concrete, 5PCS, 1/4", 5/16", 3/8", 1/2", 9/16" Tile Drill Bit, Tile Saw, Vacuum Brazed Corel Bits with 1/4" Quick Change Shank - 268830005-268820601-268830601

• ✅CORTOOL Dry Diamond Drill Bits is suitable for multi-purpose drilling in granite, marble, masonry, concrete, porcelain/ceramic tile, and stone etc. Diamond length is 3/8 Inch (10mm), total working depth is approx. 1.2 Inch (30mm). ✅Vacuum Brazed diamond technology provide very high efficiency, cuts faster and lasts longer. NEW Spiral Grooved design allows quick chip removal which makes your masonry working easy. ✅Wax inside for cooling. CORTOOL diamond tipped drill bits have wax cores built-in which automatically absorb and dissipate heat as you go. ✅Available Sizes: 1/4", 5/16", 3/8", 1/2", 9/16" diamond core drill bits set. Easy to install and use with 1/4” Quick Change Hex Shank. ✅Dry drilling and Use water for longer time. Notice: Please use with water when drilling granite and hard masonry to extend bit use-life.