1.This vacuum brazed diamond hole saw creates a high, smooth cut with no broken edges. Vacuum brazed technology allows the diamond to be in constant contact with the material, sharp and aggressive, ideal for granite marble porcelain tile concrete, etc.

2.Chamfering design,allows to drill precision holes for your bathroom sink stopper in one operation. Easy and fast.

3.12mm shank suits for 13mm chuck large electric drill and bench drill, triangle shank design allows it to be held in a 3-jaw drill chuck, with higher torque transmission and limited slippage.

4.Good for home DIY and professional users.