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SHARS 81 PC GRADE B SQUARE STEEL GAGE BLOCK SET W/ USA NIST CERT NEW L} | eBay
The inspection certificate specifies the deviation of each individual block from its nominal length. Set made of fully seasoned alloy tool steel with hardened to 65 RC to provide both long wear and resistance to stains and rust.
www.ebay.com
Such a deal! I think I'll get two.