The Angle Grinder Check Nut (Metal Lock Nut) is designed for securely fastening grinding and cutting discs on 4-inch, 5-inch, and 7-inch angle grinders. Made from high-strength metal, this lock nut ensures stability, preventing disc slippage during operation. It features a precision-threaded design for a firm grip and easy tightening or loosening with a standard grinder spanner. Compatible with most grinder brands, it is an essential accessory for professionals and DIY users alike. Whether you're working on metal, concrete, or wood, this durable check nut enhances tool safety and performance.