150 mm x 12.7 mm polishing and polishing wheels with centre hole reinforcement. Easy to install: 12.7 mm centre hole fits most table grinders and polishers. The polishing wheels make your work easy and effortless and also improve work efficiency. Stitched design: the sewing style makes these polishing discs robust and is for cutting and polishing Diameter: 150 mm face, 12.7 mm pin hole. [Usage] Polishing discs are for brass, aluminium, bronze, stainless steel, chrome, cast iron and other metals. The speed should be below 3600 n / min. Colour: white+yellow Material: cotton cloth Package Contents: 4 x Polishing Wheel Pad Kit 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.