- Want to get started in small woodworking projects, but didn't know what power carving tools to get? - Are you a woodworking professional or a DIY enthusiast, and would like to tackle some fine-grained engraving? This power grinder attachment is widely used to small and medium wood workers, you can send it to others who like woodwork as a good gift. Please make sure your grinder shaft is 5/8-11 threads (for type 4 1/2 or 5 inch American angle grinder). Specification: Material: carbon steel. Size: 4.25x1.57inches,4 x 4 inches Package List: Wood Carving Disc*2，Rotary Burr*1 You don't need any additional adapters. With the 5/8-11" mount, the sphere rotary burr compatible with 4 1/2 and 5" US grinders.