Get superior surface contact and complete contour and edge sanding on metalwork projects with the Gemini R766 medium grit arbor thread fiberglass conical flap disc. The alternating zirconia alumina and aluminum oxide grain and the angled polyester/cotton flaps help increase stock removal and speed up your job without comprising performance or price. The disc has a lightweight, durable fiberglass and resin backing plate construction that absorbs vibration, making it a perfect choice for medium grit cleaning, detailing, and finishing of 300 and 400 series stainless steels, cast iron, soft carbon steels, super alloys and titanium.