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1/8 X 4" 10 Pair Precision Parallel Set Made from fine quality tool steel stress relieved against distortion. Precision ground and hardened. Complete with fitted durable plastic case. 2 holes in each parallel. Tolerance is parallel to 0. 0003 on 2 sides, top & bottom. Includes the following sizes: 1/8 X 1/2 X 4", 1/8 X 5/8 X 4", 1/8 X 3/4 X 4", 1/8 X 7/8 X 4", 1/8 X 1 X 4", 1/8 X 1-1/8 X 4", 1/8 X 1-1/4 X 4", 1/8 X 1-3/8 X 4", 1/8 X 1-1/2 X 4", 1/8 X 1-5/8 X 4". Dimensions are within 0. 001" allowance.