Oshlun MMA-6201 3-1/8-Inch Triangular Carbide Rasp with Uni-Fit Arbor for Fein Multimaster, Dremel, and Bosch Compatible with FEIN MultiMaster, Dremel Multi-Max, Bosch Max Multi-X, Craftsman NEXTEC, Skil Multi-Tasker, Milwaukee M12, oscillating tools Triangular carbide rasp Designed for grinding concrete, stone, wood, thin set, and mortar. Also works removing paint and epoxy coatings Triangular design allows grinding into corners without damaging the adjacent material