312 x 5/16 x 1/2 NATIONAL 2 SPLINE DRIVE SPOT FACER PILOT 1/2 ARBOR TOOL HOLDER
For use holding in spot facers cutters or countersinks with 2 spline. 312, National drive # 312. Patent #2120623. Illustrations are shown for general reference or style use only. Don't miss your chance to own this item now!