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Grit, bonding, abrasive additives as well as reinforcement of the rough grinding discs are optimised for maximum metal removal rate and working life in their respective applications. Shapes: Rough grinding discs, depressed centres (shapes 27, 28, 29) Grinding angle 20° to 30° Application: On electric and pneumatic angle grinders with maximum 80 m/s circumferential speed for grinding welds, surfaces, and edges. Rough grinding disc for steel and stainless steel with long working life and high metal removal rate. Specification: A30Q-BF.