PRO-SERIES PRECISION 1/4 X 6" 9 PAIR PARALLEL SET WITH NO HOLES(3901-3009)

Pro-Series Precision 1/4 X 6" 9 Pair Parallel Set With No Holes ~ Comes with a statement of certificate of accuracy, tolerance & hardness. ~ Made from fine quality, precision ground and hardened, alloy tool steel that has been stress relieved against distortion. ~ Each parallel size clearly marked. ~ Case hardened RC 52 to 58. ~ 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". ~ Squareness to the adjacent sides with each other is .002 to.004".