... 5.Never tip off and amazing long life. Diamond core drill bit are designed to satisfying each customer's specific ... ManufacturerWe are professional in producing polishing pads, cutting blade, core drill bits and stone processing machinery for more than 6 ... manufacturer in Fujian Province.2.Main productsPolishing Pads,Cutting Blade, Core Drill Bits, Diamond Cup wheel, Finger Bits, Stone Processing ...