Keep costs down while preserving extended wheel life with the Gemini ALU A AO Type 27 grinding wheel. Featuring a durable bond and crafted using a high-quality aluminum oxide abrasive and no wax or rubber fillers, this grinding wheel delivers consistent cut rates without loading. Engineered to be used at 30-degree angles on right-angle grinders, this 1/4-inch thick depressed center wheel is great for smoothing welds, offhand stock removal and beveling aluminum and other soft metals.