Specification Brand : Star USA BulletPoint1 : Includes 2 pieces BulletPoint2 : High Speed Steel BulletPoint3 : Overall Length: 4-1/2" BulletPoint4 : CNC Ground in the USA ExternallyAssignedProductIdentifier1 : 728709182123 ExternallyAssignedProductIdentifier2 : 0728709182123 ExternallyAssignedProductIdentifier3 : 00728709182123 FinishType : Uncoated ItemName : 5/16" (.3125") HSS Drill Blank (2 Pieces.) ItemPackageDimensions_Height : 17.8 centimeters ItemPackageDimensions_Length : 1.8 centimeters ItemPackageDimensions_Width : 1.8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : drill-blanks Manufacturer : Star USA Material : High Speed Steel ModelNumber : SR-312-6 NumberOfItems : 1 PartNumber : 1131258507 ProductDescription : 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). ProductSiteLaunchDate : 2011-10-07T16:32:09.002Z Size : 5/16" SurfaceRecommendation : Alloy Steel UnitCount : 2 UnspscCode : 27111700