Standard Pack = 1 piece(s). Arbor Hole = 1/2-5/8 IN ; Diameter = 4 IN ; Face Width = 5/16 IN ; Material = Knot Type Steel Wire ; RPM = 20000 ; Trim Length = 7/8 IN ; Type = Straight Wheel ; Width = 3/8 IN ; Wire Size = 0.0118 IN ;