7 Pcs SDS Plus Chisel Set Hammer Drill Chisel Set 3/8 inch Masonry Concrete Chisel Drill Bits,Including 40mm Wide Chisel, 20mm Flat Chisel, Point Chisel, Gouge Chisel.

The cutting part of flat drill is spade form, structure is simple, manufacturing cost is low, in cutting fluid leads into hole easily, but performance of cutting and discharge chip is poorer. Flat drill structure has two types of integral and assembled. The whole is mainly used for drilling 0.03 ~ 0.5 mm diameter micro hole. Prefabricated flat drill blade can be changed, can use internal cooling, mainly used for drilling 25 ~ 500mm diameter of large holes.