Flexovit HP Carbon Steel Wire Cup Brushes are available in crimped or knot wire. High quality steel wire and rugged construction provide fast, efficient brushing on production work. Knotted Wire Cup - Perfect for heavy duty cleaning and rough scale removal. Knock-off bridle option restrains the knots, providing flare control and prevents premature wire breakage. As the brush wears down remove the bridle to expose new wire. CARBON WIRE: .020 - For general purpose cleaning and deburring.