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. Both the body and head are hardened and ground for strength and accuracy on all Royal Bull Head Live Centers.