1/2 X .751 X .665 X 1-3/8 X 3-1/8 Taper 3/4 Spiral Flute Pipe Reamer ~ Right hand cut tapered to 3/4″ per foot. ~ Designed for reaming holes to be tapped with American Standard Taper Pipe Taps (NPT). ~ Large end diameter is .751. ~ Small end diameter is .665. ~ Flute length is 1-3/8″. ~ Flute length is 3-1/8″. ~ High speed steel. Right hand cut tapered to 3/4″ per foot. Designed for reaming holes to be tapped with American Standard Taper Pipe Taps (NPT). Large end diameter is .751. Small end diameter is .665. Flute length is 1-3/8″.