This tool set is the main accessory for boring and CNC milling machine works, such as coordinating the boring machine, horizontal boring machine and ordinary boring machine. It is used to bore cylindrical, shallow groove, step hole, hole end face and cut the inside hole and ring groove on the external or other processing. This boring tool set is made of quality steel with excellent hardness and toughness to provide stable performance. It includes 9 pcs 12 mm boring cutters in different sizes, easy to use and replace. This boring tool kit includes boring head, shank, cutters and wrenches to meet your various needs. A box is included in the delivery for easy storage and to carry conveniently.