Precision Ground - Specifically made as blanks for precision drills. Republic blanks have been used for many purposes over the years. Republic H.S.S. blanks have been used as shafts, arbors, guide rods, rollers, gages, alignment pins, punches, knockout pins, as well as for stock in the manufacturing of specialty tools and instruments. With tight dimensional tolerances, Republic drill blanks are perfect for any project needing precise finished ground stock. Drill Blank Tolerances: Up to .5000" (-.0002" or .005mm), from .5001" to .6250" (-.0003 or -.008mm), from .6251" to 1.0000" (-.0005" or -.013mm).