Cup Brush 1PC: 50 mm (2 inch); Wheel Brush 1PC: 75mm (3 inch); Pen-Shape Brush 1PCS: 25mm (1 inch). This nylon wheel brushes set indeed does a good job removing rust and from small areas, corners, screw and bolt heads. Maintains shape & not rust, not shed bristles under normal conditions. to use than wire brushes, SYNTHETIC, chemical Nylon Bristles are extremely safe and not spark, corrode, rust, shed, puncture skin, unlike more abrasive metal or steel brushes | Industry's softest yet sturdiest Bristle integrity with outstanding bend recovery after continued and prolonged use. offers design for coarse brushing preparation, heavy grout removal, polishing and scrubbing, this Nylon Cup Brush is gentle on all materials and made from top quality nylon for maximal user safety, gentle cleaning & extended brush use. Designed for easy access into narrow holes and confined areas. Crimped style for light to medium duty applications, Remove rust, scale and paint in hard to reach areas. Nylon cup and wheels abrasive Brushes mounted on 6.0mm round shanks, Fits most drill or Impact Drivers Nylon Brush kit is an All-Material-In-1, safe and rust and paint remover and cleaner on ALL wet or dry applications like Metal, Steel, Stainless Steel, Wood, Aluminum, Plastic, PVC, Tiles, Stones and more, while maintaining its bristle integrity after extended use. Material: nylon colour: red Package Contents: 3 x Wheel Brushes Only the above package content, other products are not included. Note: Light 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.