Ideaful to clean rust, burs, paints and dirty; Easy fitting, safety in operation,rilable quality Save time, save money Stringer wheel brush Wheel style with 1/4" knotSize available: 4"(100mm), 4 1/2", 5", 6",7"Abor: 5/8"-11; M14 , Abor hole: 5/8", 7/8"Filling material: carbon steel .014(0.35mm), or .020(0.5mm)