Vacuum Brazed Diamond Hole Saw / Core Drill Bit Hexagon Shank - Jdrdiatool ( China ) - Offers to Sell and Export - Saturday 2 December 2017 1:13 am - vacuum brazed diamond hole saw core drill bit hexagon shank 1 vacuum brazed diamond hole saw is also called vacuum brazed diamond core drill bits used in drilling or making holes for ceramic porcelain tile ...