Bison 7-191-515 Machine Tool Arbors & Arbor Adapters; Adapter Type: Milling Machine; Milling Arbor Style: Stub; Shank Type: Taper; Taper Size: CAT 50; Taper Size: CAT 50; Overall Length (Decimal Inch): 13.5800; Arbor Diameter (Inch): 1; Arbor Diamete