SPI Precision 9 Pair 1/4" Parallel Set Features: 1/4" thick X 6" long hardened and ground high grade alloy steel. 3/4" - 1-3/4" heights in 1/8" increments. Parallel within 0.0002". Paired within 0.0002" in height. Hardness 52-58 RC. Supplied in durable mol
SPI Precision 9 Pair 1/4″ Parallel Set
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