The clever design of the Union Butterfield 1994 combination drill taps means the same tool can be used for drilling and tapping shallow through holes, both by machine and hand, bringing increased efficiency by reducing the number of tools required for the operation. The combination drill taps are available for both UNC and UNF thread forms and are manufactured from High Speed Steel for longer tool life and great performance, whilst the bright finish prevents workpiece material from sticking to the cutting surfaces of the tool so you get accurate threads.