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FIRESTORM "EXTREME" CERAMIC: (Blue) "Made in Germany" ACTIROX stands for 100% geometrically shaped ceramic grain. Aggressive grinding is ensured by abrasive grains that stand upright at an optimum angle. An aggressive cut combined with low contact pressure results in less noise and vibration, and less strain for the machine and its operators. Faster grinding significantly reduces the machining time. The TOP SIZE coat results in a cool cut. Recommended for angle grinders in the upper power range. FIRESTORM II CERAMIC: (Brick Red) "Made in Germany" Optimized self-sharpening effect results in an extremely high stock removal rate thanks to constant recreation of sharp grain points. Delivering consistent cut rates & fewer random deep scratches. They remove approximately 30% more material than our original Firestorm Ceramic product (shown below). They work best on medium-pressure applications on heat-sensitive materials such as stainless steel, titanium, and other super alloys, but they will also perform great on carbon and mild steel applications including mill scale. The “Top Sized” grinding aid also allows it to perform well on aluminum without loading! FIRESTORM "Original" CERAMIC: (Bright Red) "Made in Germany" These are the original Firestorm discs. Even though we've introduced the next generation "Firestorm II" which offer longer life, these original discs feature a fast cut combined with long life. They work great on medium-pressure applications on heat-sensitive materials such as stainless steel, titanium, and other super alloys, but they will also perform great on carbon and mild steel applications including mill scale. The “Top Sized” grinding aid also allows it to perform well on aluminum without loading! ZIRC PREMIUM: (Blue) These "Made in Germany" discs will hold up under the most demanding applications. ZIRC is a good choice for aggressive grinding on most materials. Do NOT work on a mill scale. AO PREMIUM: (Brown) These "Made in Germany" dis