Precise 1-2-3 Blocks with 3/8-16, 23 Tapped Holes – TBS-123

Precise 1-2-3 Blocks with 3/8"-16, 23 Tapped Holes 1-2-3 Blocks, Matched Pair. Hardened & ground on all 6 sides, 5 tapped holes, 18 untapped, .0001" squareness per inch, 1" x 2" x 3" per block. No.TBS-123 See all parts in the Precise Toolmakers Set