Allied Machine and Engineering HYD-CV50M20 Hydraulic Tool Holders & Chucks; Shank Type: Taper ; Taper Size: CAT50 ; Hole Diameter (Decimal Inch): 0.7874 ; Shank Diameter (Decimal Inch): 2.7500 ; Shank Diameter (mm): 69.8500 ; Shank Diameter (Inch): 2