HHIP 1/8 X 1-1/2 X 6 Parallel Made from fine quality tool steel stress relieved against distortion. Precision ground and hardened. 2 Holes in each parallel are designed for easier handling and set-ups. Tolerance is parallel to 0.0003 on 2 sides, top and bottom. Dimensions are within .0001 allowance. Sold by the pair.