For etching and polishing, aluminum oxide is a favored abrasive. Other materials are also acceptable for this purpose, but aluminum oxide has several unique features that make it a better choice than others. It is a favorite among industry professionals due to its adaptability and strength. Similar to sandpaper, aluminum oxide is ground into various grains and may be used in a variety of ways, and is even recyclable. You can continue to use it till it breaks down. Key Features: possesses a lot of strength and endurance Aluminum Oxide is an abrasive with a low iron concentration that won't rust your part's surface. Rust deposits frequently cause issues in later processes It is a cost-effective abrasive since it can be recycled and reused for several passes Product Specifications: SKU: K533320 UPC: 033K320B-12700 Weight: 1.66 LBS Grade Or Grit: 320 Size: 5" P-Grade Manufacturer Part Number (MPN): 033K320B-12700 Quantity: 1 Long lasting abrasive discs for use on wood, fiberglass, aluminum and stainless steel. Kling-On discs can be used repeatedly. Come 100 discs per box.