Diamond grit hole saws are employed for particularly tricky materials like porcelain, glass, along with other tiles. They can be designed with artificial diamond grains embedded in a metal bond matrix. A: Spade drill bits are speedier than hole saws. If you would like drill various holes in less time, https://stephenqomie.goabroadblog.com/34491199/hss-hole-saw-no-further-a-mystery