Criterion 20400 (S-1-1 2B) Boring Head, Straight Shank is a compact, 1-inch outer-diameter boring head with a 5/8-inch bore, designed to mount on a straight-shank boring bar for precise hole enlargement. Its straight-shank design enables straightforward alignment on compatible machines, supporting repeatable bore sizing in metalworking operations. The model designation (S-1-1 2B) identifies the specific variant within Criterion's lineup for users seeking a reliable small-diameter boring head.
