Universal Compatibility & Easy Installation: These flange nuts are designed for easy installation and removal, making them perfect for both professional and hobbyist use. They are compatible with all 4", 4-1/2", and 5/7/9" grinders with a 5/8-11" threaded shaft, accommodating a wide range of angle grinders. Tool-Free Quick Change & High Efficiency: Featuring a silver pull ring and black knurled grip, these flange nuts allow for hand tightening without tools. The quick-release design facilitates rapid attachment changes, significantly reducing downtime and enhancing the efficiency of your grinding or cutting operations. Carbon Steel for : Constructed from robust carbon steel, these angle grinder lock nuts are engineered to resist wear, abrasion, and deformation. Ideal for rigorous grinding, cutting, and wire brushing tasks, they offer dependable performance and extended durability as replacement nuts. Enhanced Stability & Versatile Fit: Providing a secure grip, these lock nuts stability during operation. They are compatible with various grinding wheels, including cutting blades, grinding discs, and cup-shaped grinding wheels, ensuring a versatile fit for multiple grinding tasks., Weight: 0.74626475687 Pounds, Manufacturer: Htuteyy