Brown & Sharpe 599-750-50 Universal 1-2-3 Blocks Set

Item Description Consisting of a matched pair of 1"x2"x3" blocks, five plated 5/16"-18" socket head cap screws and a hex key wrench Each block is precision ground and case hardened on all 6 surfaces Surface finish 6 to 16 micro-inches Squareness on all sides to .0001" There are a total of 11 holes on three faces. Five 5/16-18" tapped holes arranged for holding down and for conversion to an angle plate. Six holes drilled through with deep recesses for easy clamping Blocks are oversized to allow for normal lapping to .0003"