Specification Brand : Techniks BulletPoint1 : Our part # TEC-04895 BulletPoint2 : Extension length should not exceed a 4 : 1 ratio of length to diameter. For example, a 1/2" shank should not extend more than 2" in front of the holder. This is only true for applications where the extension is rotating. BulletPoint3 : 0.0001" runout from shank to pocket BulletPoint4 : Precision ground for best T.I.R. BulletPoint5 : Center Height 4” ExternallyAssignedProductIdentifier1 : 0650229401135 ExternallyAssignedProductIdentifier2 : 650229401135 ItemName : Techniks ER16 x 1/2" Collet Holder Extension x 140mm Length ItemPackageQuantity : 1 ItemTypeKeyword : workholding-collets Manufacturer : Techniks Inc. Material : Alloy Steel ModelNumber : 8542034528 NumberOfItems : 1 PartNumber : 04895 ProductDescription : Techniks ER16 x 1/2" Collet Holder Extension x 140mm Length ProductSiteLaunchDate : 2016-08-17T21:24:49.941Z UnitCount : 1