50 Adjustable Boring Head uses 1/2" Boring Bar 3/4" Shaft. 0001 Adjustable Boring Head Boring Bore Bar Holder. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Adapters & Holders\Boring Head & Adapters". The seller is "usatooldude" and is located in this country: US. This item can be shipped to United States.