High Speed Steel Taper Pin Reamers are multi-fluted, end cutting tools used to resize and refinish previously formed holes to fit standard taper pins. Helical flute taper pin machine reamers are the best economical choice for shops producing taper pin holes by machine reaming. The high left-hand spiral construction moves chips forward, preventing chips from packing in flutes to allow free cutting at high speeds, along with a fine finish. Construction Taper Reamers feature a tapered end to facilitate hole entry, and a 3 flat straight shank to prevent slipping in the drill chuck of portable electric and air tools. Construction taper reamers have a faster spiral helix which provides better chip ejection and finer finishes, and a safety flange which prevents overpenetration.