Item Type: Wheel Cup Brush Set Material: Brass, Stainless Steel Shank Diameter: Approx. 6mm / 0.24in Brush Head Diameter: Approx. 10mm / 0.40in, 16mm / 0.63in, 25mm / 1.00in, 30mm / 1.18in, 50mm / 2.00in, 75mm / 3.00in Maximum Speed: 4500RPM 1Brass + Stainless Steel: High quality brass, stainless steel, wear resistant and durable, long service life, and reliable 2Variable Shapes Sizes: With a variety of shapes and sizes, suitable for all kinds of space and angle operations, to meet user needs 3Application: The brush is used for removing burrs, rust, dust, oxide layers, and paint in hard reaches areas, etc. 4Wide Uses: The larger size is suitable for large area fast work, and the smaller size is convenient for fine work that is difficult to enter the space 5Applicable Industry: This is polishing and cleaning brush that can be widely used for shipping, aviation, automobile, construction and other industriesDo a good job of safety protection when using9 x Steel Wire Brush