Standard Pack = 1 piece(s). Coolant Hole Diameter Inch = 10.0300 ; System Size Machine Side = PSC50 ; Adapter/Shank/Bore Diameter Inch = 1.9690 ; Adapter/Shank/Bore Diameter mm = 50 ; Adapt/Shank/BoreDiaWKPS In = 0.7880 ; Adapt/Shank/BoreDiaWKPS mm = 20 ;