Made from high-grade alloy steel, hardened and ground from 1/8" stock with 2 holes in each parallel. Height specifications relate to consistency within each pair. Absolute heights are nominal. 10 pairs, 6" length, 1/8" width 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2", 1-5/8" Accuracy: Parallelism 0.0002" Paired in height 0.00015" Hardness 58-63 HRC

Made from high-grade alloy steel, hardened and ground from 1/8" stock with 2 holes in each parallel. Height specifications relate to consistency within each pair. Absolute heights are nominal. 10 pairs, 6" length, 1/8" width 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2", 1-5/8" Accuracy: Parallelism 0.0002" Paired in height 0.00015" Hardness 58-63 HRC