The Wilmar W5811NW 5/8"-11 Grinder Nut and Backer is a must-have accessory for angle grinders. This set includes a grinder nut and a backer plate, both designed to securely hold grinding wheels and other abrasive discs. The 5/8"-11 thread size ensures compatibility with most angle grinders. The nut and backer are made from high-quality materials, providing durability and reliability during heavy-duty grinding tasks. With this grinder nut and backer, you can securely attach and change grinding wheels, making it easier and safer to use your angle grinder.