Hand Taper Pin Reamers are multi-fluted, end cutting tools used to resize previously formed holes to fit standard taper pins. Straight flutes provide a smooth finish in through holes, while spiral flute models provide better chip clearance and are recommended for blind hole applications. The hole to be reamed should be a few thousandths smaller than the small diameter of finished-reamed hole for best results. High speed steel provides good wear resistance in mild steels & non-ferrous materials. Square shank fits in a T-handle or straight tap wrench.