Shars 1 Matched Pair Ultra Precision 1-2-3 123 Block Set 23 Holes New ^]
Made of hardened Steel. Has 23 holes with 5 holes tap to 3/8-16 UNC and 18 untapped holes. Pairs are matched to a tolerance of 0.0002". Ultra Precision 1-2-3 Block. Precision ground on all six sides. OF HOLES 23.