Accusize Arbor: 1'', Range: 2-1/4''-2-3/4'', R8 Shank Shell Face Mill Arbor Adapter Holder for Bridgeport 7/16''-20, Fg22-8064

R8 Shank Arbor dia.: 1", Range dia.: 2-1/4" - 2-3/4" For the bridgeport - 7/16"-20 Drawbar thread Holds shell mills. FG22-8064 For the bridgeport - 7/16"-20 Drawbar thread Holds shell mills.