Material and Construction: Both wire wheel brush and cup brush are made of high quality carbon steel, constructed with internal holding plate, 5/8 Inch-11 UNC threaded arbor, 0.02Inch knotted wires, 0.014Inch coarse crimped wires, MAX RPM 12,50. Safe and : This grinder wire brush set consists of two reinforced steel plates to hold the wire in place and prevent it from falling or flying apart. The carbon steel wire also ensures extreme durability. Wide Applications: Grinder wire brushes can be used for both light and heavy duty work and are suitable for removing weld scale/spatter/rust/paint and severe . Widely used for stripping and sanding metal surfaces and preparation before painting or plating. Easy to Install: Simply attach the wire brush wheel to the correct angle grinder and wear protective tools for use, making it easy and quick for professionals and amateurs alike to get started. Colour:As Shown Material:Metal Package Contents: 1set * wire wheel for angle grinder(10pcs) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.