Made from fine quality tool steel stress relieved against distortion, precision ground and hardened, these precision parallels are recommended for layout work, standards and setups. The holes are designed for easier handling and setups. Tolerance: Parallel to 0.0003 on 2 sides, top and bottom. Dimensions: Within 0.001 allowance. Hardness: Case hardened to HRC 55 to 62 on 2 sides, top and bottom only. Supplied in matched pairs.
