General description The 15Pcs 4 Inch Nylon Fiber Flap Disc Polishing Grinding Wheel is designed for use with angle grinders. This set includes 15 red felt discs, perfect for polishing and buffing various surfaces. Technical specifications Size: 100mm (4 inches) Bore Diameter: 17mm Material: Scouring pad Color: Red Measurement allowed error: +/- 1-3cm Other information Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product.