Dry Diamond Drill Bit Set - 6/8/10mm Hole Saw and 1pc 4/5" Dimaond Chamfer bit for Granite Marble Porcelain Ceramic,Vacuum Brazed Diamond Core Drill Bit Kit - BGTEC BGTEC

• 【Size】Total 4 pieces, 3 pcs dry diamond drill bits (1/4" 6mm+1pc 5/16" 8mm, 1pc 3/8" 10mm ), Round Shank and 1pc Diamond Chamfer bit (4/5" 20mm). 【Application】For Granite, Tile, Ceramic, Marble, Stone, Porcelain, Masonry. Use water for longer time. 【Wax inside】For cooling,our Diamond Tipped Drill Bits have wax cores built-in which automatically absorb and dissipate heat as you go. 【Vacuum Brazed technology】 Higher efficiency, faster working speed, longer service life. 【Note】Used for hand drill and bench drill,Hand drill at 2000-5000RPM, the slower the shorter the life.