This quality-plus polisher is more durable than silicon rubber for longer wear and better flexibility. It is especially popular for polishing delicate areas such as bezels or prongs, and produce an extra-fine finish, from shaping to high-shine, on all metals. Optimum rpm of 5000–12,000 is suitable for most projects. Brand: AdvantEdge Hole size: 1/16" Country of origin: USA Type: Wheel MSDS