Husqvarna FR3 - Metal Cutting/Fire Rescue Blades FR3: metal, concrete, brick/block. Brazed diamond technology. Specially recommended when free cutting of any material is a critical requirement, including steel. Optimal Concrete, Iron, Ductile iron, Metal Good Reinforced concrete, Concrete hard, Concrete medium, Concrete soft, Dry concrete, Granite, Marble, Natural stone, Natural sandstone, Brick, Block, Cured concrete hard, Cured concrete medium, Cured concrete soft Acceptable Ceramic tiles Husqvarna NXS - Metal Cutting/Fire Rescue Blades NXS: metal, concrete, stone, rebar, brick/block. Thicker, electroplated core with cooling holes, for protection during deep cutting. Extremely fast turbo segment. Optimal Concrete hard, Concrete medium, Concrete soft, Concrete, Iron, Ductile iron, Metal, Cured concrete hard, Cured concrete medium, Cured concrete soft Good Reinforced concrete, Granite, Brick, Roof tile Acceptable Block, Abrasive Fits to K 760 Rescue, K 760, K 760 with OilGuard, K 40, K 2500