4" x 5/8"-11 Arbor .020 Carbon Steel, Stringer Bead, Wire Wheel, Highly Specified Wire Grades Are Constructed With Internal Holding Plate To Ensure Consistency & Safety, Constructed For Even Balance Which Provides Smooth Performance, Knotted Wire Is For Heavy Material Removal, Crimped Wire Provides Flexibility For Light Removal Of Rust & Paint & General Cleaning.