Standard Pack = 1 piece(s). Diameter = 1 IN ; Length = 1 IN ; Material = 38A ; Maximum RPM = 34,500 ; Shank Size = 1/4 IN x 1 1/2 IN ; Shape = A38 ; Spindle Diameter = 1/4 IN ; Thickness = 1 1/4 IN ; Type = Mounted Points - A Shape ;