Similar to 4702, but with a tapered shank for machine applications where the reamer is held directly in the spindle, 4703 Union Butterfield 180 degree angle counterbores should be used in conjunction with 4704 pilots to create holes to accommodate standard sockets and cap screw heads. They have a bright finish to ensure clean and accurate counterboring by preventing workpiece material from sticking to the cutting surfaces of the tool, and are made from High Speed Steel so can be used for counterboring holes in aluminum, steel, stainless steel and a variety of other materials. 4703 taper shank counterbores are suitable for use in conventional and CNC machines.