5/16" #312 NATIONAL 3 SPLINE DRIVE REVERSE BACK SPOT FACER PILOT HOLDER MT2
5/16" #312 NATIONAL 3 SPLINE BACK SPOT FACER PILOT MT2. REVERSE SPOT FACER HOLDER. For use holding inverted spot facers or countersinks with #312 (5/16") National 3-spline drive. Arbor is # 2 Morse taper shank, MT2.