Allied Machine and Engineering HYD-HSKA63M20 Hydraulic Tool Holders & Chucks; Shank Type: Taper ; Taper Size: HSK63A ; Hole Diameter (Decimal Inch): 0.7874 ; Shank Diameter (Decimal Inch): 1.8902 ; Shank Diameter (mm): 48.0100 ; Nose Diameter (Decima