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HHIP Pro-Series Precision 1/32 x 6" 10 Pair Ultra Thin Parallel Set comes with a statement of certificate of accuracy, tolerance and hardness. Made from fine quality, precision ground and hardened, alloy tool steel that has been stress relieved against distortion. Each parallel size clearly marked. Hardness is RC 40 to 50. Complete with fitted wood case. Total parallelism within the entire length to .0002". Flatness or straightness to .0002". Height dimensions are + or - .0002". Width/thickness to + or - .005".