Drill bit made of 5% cobalt HSS fast steel ground and heat-treated. Cobalt alloy offers the tool greater heat resistance and thus greater wear resistance increasing the life of the drill bit. Special split point sharpening facilitates penetration and improves performance thanks to the reduced friction and less heating of the drill bit. Gold finish Attractive side opening case makes it easy to remove the tool. It has a graduated conical channel to know the diameter of the drill bit.