HHIP #10 High Speed Steel Spiral Flute Taper Pin Reamer Spiral flute taper pin reamers are used to turn a straight hole into a tapered hole for standard taper pins. They are generally used by hand but can also be used with a machine. Recommended for applications where the reamer tends to wedge itself. The square on the end of the shank of the reamer is suitable for holding it in a tap wrench or vise. The free cutting action at high speeds produces a good finish and minimizes chip packing in the flutes.