Vertex Boring Head Metric Graduations. They are a quality head. Please don't compare with others.Threaded 1.1/2 x 18tpi Various shanks available in our shop. The item "Vertex Boring Head 100mm Metric Graduations R8 Shank" is in sale since Saturday, October 27, 2018. This item is in the category "Business, Office & Industrial\CNC, Metalworking & Manufacturing\Metalworking Equipment\Machining Centers & Milling Machines". The seller is "fordeight" and is located in West Midlands. This item can be shipped worldwide.