This is a used Boring Head in GREAT condition. Shank is Criterion as well. Distance Between Hole Centers: 1. Outboard Hole Boring Range: 2.375" to 5.125". Cross Hole Boring Range: 4.937" to 11".Shank Thread - 1-1/2 - 18 tpi. Comes as shown in pictures. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Adapters & Holders\Boring Head & Adapters". The seller is "the_machinists_dream" and is located in this country: US. This item can be shipped worldwide.