Accuracy: ± 0.0005" TIR Guaranteed. Construction: Two matched angular Contact bearings provides good thrust and radial capacities. Bearings are protected by a combination steel shield and neoprene seal. Point has a 60° included angle. Oversized head diameter, 1/8" larger then normal size. Reduced knockout diameter prevents taper from mushrooming. Application: Designed for pipe work, tube work, parts with extra large center holes.