... is a new product after the hot-pressed and electroplated drill bit. 1. It has a super long life. The ... low cost.7.PDC bit is mainly used for drilling soft and medium rock, and it must work under low ... .What rock can i cut with this core bit? soft rockMudstone, shale, soft sand, peat, rock, mudstone, tuff, hard marl, marl ... slate, volcanic rocks, chert, basalt, etc11,12 grade PDC drill bit (single tube)