1.This core bit is designed for tough materials such as granite, marble, porcelain, tile, concrete, etc. Good for drilling water outlet holes on the stone basin, stone laundry trough, garden planter and so on.
2.Sintered blade with high diamond concentration gives maximum footage and drilling speed, while thick blade for the longer working life of the bit.

3.Chamfering design allows drilling precision holes for your bathroom water outlet in one operation. Easy and fast.

4.12mm 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.

5.Good for home DIY and professional users.