Features: Upgraded your rotary tool with 2pcs brown corundum grinding stones featuring 1/4inch hexagonal shank, perfect for sharpening, carving, and polishing across multiple materials. The set includes cylindrical and conical grinding head (6.35mm standard shank) designed for quick drill material removal in tight spaces. Ideal for metalworkers, woodcrafters, and DIY enthusiasts needing reliable mounted grinding points for jewelry making, tool maintenance, or finishing projects. Effortlessly polish metal surfaces, refine wood edges, or restore ceramic/glass items using these heat resistant rotary grinding stones in workshops or home garages. These electric drill sharpening head minimize dust while maintaining consistent grinding efficiency. Specifications: Component:Metal Size:Approx.24mm/0.94inch Package Includes: 2Pcs Grinding Head note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.