Standard Pack = 1 piece(s). Arbor Hole = 5/8-11 IN ; Diameter = 4 IN ; Material = Carbon Steel ; RPM = 20000 ; Size = 4 x 5/8-11 IN ; Standard Pack = 10 ; Style = Stringer Bead ; Thickness = Wire Wheel ; Type = Knotted Brush Wire Size = 0.02 ;