The Faithfull Flat Twist Knot Wire Brush is compatible with 115mm (4.1/2in) angle grinders with a M14 x 2 mount. Twist knot brushes are suitable for the removal of slag, rust, scale or even dried cement. Perfect for use on stainless steel. Standard wire brushes when used on stainless steel can contaminate and cause the material to rust. Conforms to ISO 9001, DIN EN 1083-1 and 2. Specification Diameter 115 x 12mm face Thread M14 x 2 Wire Twist Knot Stainless Steel Grade 304, 0.35mm