Specification Brand : STAR USA Label : STAR USA Manufacturer : STAR USA MaterialType : Carbide PartNumber : 1300120 ProductGroup : BISS Basic ProductTypeName : DRILL_BITS Publisher : STAR USA SmallImage_Height : 8 SmallImage_URL : https://m.media-amazon.com/images/I/21xNuNs5jkL._SL75_.jpg SmallImage_Width : 75 Studio : STAR USA Title : Carbide Tipped Taper Length Drill - Diameter: 5/16", Decimal Equivalent: .3125", Flute Length: 4", OAL: 6-3/8"