Specification Brand : Hougen BulletPoint1 : Hougen has been making “12, 000-series” annular cutters since we invented them in 1974. At one time, our president was putting the tooth geometry on every hougen cutter in the world. BulletPoint2 : 3/4" two flats for cutter mounting, o. D. Margins, i. D. Margins, fully fluted tools, patented tooth geometries, material types, coatings, and resharpenability. BulletPoint3 : Hougen cutters with the hougen-edge, feature a patented tooth geometry that provides long tool life, less chatter, and extended resharpenability. BulletPoint4 : Compared to traditional tooling (twist drills, etc. ) hougen cutters can multiply your cutting speed by up to 3 times. And you get longer tool life, a more accurate hole, a better finish, with no burrs. BulletPoint5 : Hougen cutters maximize feed rates because up to 10 or more cutting edges distribute the cutting load evenly. By converting a smaller area to chips, hougen cutters require less horsepower and thrust. American made. ExternallyAssignedProductIdentifier1 : 662850010730 ExternallyAssignedProductIdentifier2 : 0662850010730 FinishType : Uncoated ItemName : HOUGEN RotaCut Sheet Metal Annular Cutters - Tool Material: High speed steel Size: 3/8" [pack of 4] ItemPackageQuantity : 1 ItemTypeKeyword : annular-cutters Manufacturer : Hougen Manufacturing Material : High Speed Steel ModelNumber : 12164 NationalStockNumber : 3455-01-218-3543 NumberOfFlutes : 2 NumberOfItems : 1 NumberOfPieces : 4 PartNumber : 11108 ProductDescription : HOUGEN 3/8" ROTACUT HOLE CUTTER (11108) ProductSiteLaunchDate : 2013-03-29T15:38:35.333Z SurfaceRecommendation : Metal UnitCount : 4 UnspscCode : 20121600