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