Specification Brand : Vermont Gage CompatibleMaterial : Alloy Steel ItemName : NST 40-1/2" End Mill Holder ItemTypeKeyword : end-mill-holders Manufacturer : Meda - Superior Import Material : Alloy Steel PartNumber : 56630009754 ProductDescription : Made of alloy forged steel for long, durable service life. * Hardened to RC 56-60 and ground to ensure maximum accuracy. * Draw Bar Threads: NST 30: 1/2" - 13 * Holders are for double end mills. ProductSiteLaunchDate : 2012-08-06T15:50:57.625Z UnitCount : 1 UnspscCode : 27110000