Antengdatool 2PCS 1/4 Inch Dry/Wet Diamond Hole Saw for Angle Grinder - 6mm Porcelain/Tile Core Drill Bits for Ceramic Marble Brick Granite Stones Attach Round Shank Adapter - Shanghai Antengda Tools Co., Ltd., DHST58001006*2

• Dry/Wet Drilling, no worry about adding water when in the processing, adding water will prolong the workable lifes, water/Wax(6mm) will cool down the segment New design of Vacuum Brazed tech. for fast and smooth drilling efficient, designed for save your times, get longer life than tradition coated diamond drill bits With 5/8"-11 thread, easy operate on the angle grinder. attached round shand adpater for wide application on Hand Drill, Bench Drill, no worrying of looking for adapter Application: drilling clean holes on Porcelain/Tile Ceramic Tile Granite Marble Stone Brick masonry and so on for creating a high precision,smooth cut with no broken edges Perfect for drilling the faucet-mounting holes in countertops and vanities, do not use this adapter and Core Drill Bits on Hammer Model If the materials are too much hard, like hard granite, hard rocks, recommend use this diamond bit with water to get longer working life