Overview:I've been using the WA GRINDER Curved Edge Flap Discs for various grinding tasks, specifically designed for fillet welds and corner work. These discs are made from a mix of ceramic and zirconia, promising durability and high performance in aggressive grinding applications. The pack includes five 4-inch discs with a grit of 40, suitable for fitting standard arbors.Pros:- The aggressive nature of the discs makes them highly effective at removing material quickly, significantly speeding up work processes.- They fit well on standard arbors, making them easy to install and use on most angle grinders.- Durability is a standout feature; after multiple uses, there are no signs of the discs coming apart or shredding. This reliability also contributes to safety, preventing the potential hazards associated with disc failure.Final Thoughts:The WA GRINDER Curved Edge Flap Discs are excellent for anyone needing to perform precise and efficient grinding in corners and on welds. Their design and material composition make them particularly effective for tough grinding tasks, while their durability ensures long-lasting performance without the risk of premature wear or safety issues. These discs are highly recommended for professionals and DIY enthusiasts who require reliable and powerful grinding tools.