2 1/2 OD x 5/8-18 tpi mount. 50 TENTHSET BORING HEAD mill milling bar holder tool 2 1/2 OD" is in sale since Thursday, August 20, 2020. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Adapters & Holders\Boring Head & Adapters". The seller is "xtrucker_99" and is located in Milroy, Indiana. This item can be shipped worldwide.