Fowler Steel 1-2-3 Blocks 52-439-031-0

Features: • 1-2-3 Blocks—tolerances  guaranteed to .0001" for squareness per inch. • Available in two styles—with one or thirty-one holes. Blocks are matched in pairs and measure 1" x 2" x 3". • Very useful in mounting work for precision grinding, layout work, etc. • Blocks hardened to 58-60 Rockwell C. • Ground to surface finish 6-10 microinches • Matched accuracy within ± .0002" • Price per pair