18.50Mm Diameter X 6" Long Hss Jobber Length Drill Blank. Specifically Made As Blanks For Precision Drills And Reamers, Vermont Gage Blanks Have Been Used For Many Purposes. Over The Years, Vermont Gage Hss Blanks Have Been Used As Shafts, Arbors, Guide Rods, Rollers, Gages, Alignment Pins, Punches, Knock-Out Pins, As Well As For Stock In The Manufacturing Of Specialty Tools And Instruments. With Tight Dimensional Tolerances, Vermont Gage Drill & Reamer 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) | Reamer Blank Tolerances: Up To .5000" (+.0002" Or +.005Mm) From .5001" To .6250" (+.0003" Or +.008Mm) From .6251" To 1.0000" (+.0005" Or +.013Mm) | Inch And Metric Diameter Sizes | High Speed Tool Steel; 62/65 Rc | Jobber Lengths | 10 Microinch Finish Or Better | Marked With Size Vermont Gage Usa Part #501418500