Specification Brand : Vermont Gage BulletPoint : For holding 3/8" shank end mills. BulletPoint1 : Shank Size: NMTB 30 BulletPoint2 : TIR (In.): 0.0004 BulletPoint3 : Drawbar Thread Size: 1/2x13UNC BulletPoint4 : Arbor Diameter: 3/4 BulletPoint5 : Key Width for Face Mill Keyway: 0.31 ExternallyAssignedProductIdentifier1 : 0000120256318 ExternallyAssignedProductIdentifier2 : 000120256318 IncludedComponents : Fitted in Case ItemDisplayWeight : 0.6 kilograms ItemName : MT2-3/8" End Mill Holder,"A" Style - with Tang End ItemPackageDimensions_Height : 3.2 inches ItemPackageDimensions_Length : 6 inches ItemPackageDimensions_Width : 5.5 inches ItemTypeKeyword : tool-holders Manufacturer : Meda - Superior Import Material : Alloy Steel NumberOfItems : 1 PartNumber : 56640009755 ProductDescription : Made of alloy forged steel for long, durable service life. * Hardened to RC 56-60 and ground to ensure maximum accuracy. * Holders are for double end mills. ProductDescription1 : H6 arbor tolerance to improve cutter chattering and overall cutting tool life ProductDescription2 : T.I.R. 0.0004" measured from NMTB 30 taper to face and arbor ProductDescription3 : Made from alloy steel harden to 54-60 HRc ProductDescription4 : Taper ground to AT3 or better accuracy standard for maximum contact with spindle. This tool holder has used Stotz Air/Electronic Gaging for production and finish inspection. Stotz has been chosen by major aircraft companies as the best and most consistent gaging for tool holder shanks ProductDescription5 : All critical surface are precision ground, Each holder comes with a lab certificate on its taper accuracy and runout measurement ProductSiteLaunchDate : 2012-08-06T16:46:59.994Z Style : HSK-63A SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1