Genuine HSS-M35-co with cobalt 5% full grinding straight shank twist drill, non-ordinary appearance of the similar toasted jute drill pretend, good quality, hardThe overall heat treatment hardness can reach 64-68HRC, the service life is 2~3 times that of the common hemp drill bit, has the characteristic such as the positioning precision cutting quick chip discharge ability is strong, the surface is baked yellow treatment, has the abrasion resistance more. Suitable for all kinds of stainless steel, die steel, I-steel, ordinary steel, Angle iron, aluminum, copper, wood and other materials of drilling sharp durable quality assurance, trustworthy.