砖瓦钻的花岗岩石

It's called Masonry drill bit for the granite,rock,Masonry drill bit,guide drill bit,concrete drill bit,More informations, kindly mail or call us,Thanks for your visiting.Features:1) Available size: 3.0mm - 30.0mm 2 Material: 40Cr 3) Carbide tip: YG8C 4) Finish: black oxide, zinc plated, nickel plated, chrome plated and sand blast 5) Type of flute: parabola, helix, or according to yourrequests