These grinding stones with 3mm shanks are compatible with most rotary tools including Dremel tools, Proxxon tools, and other similar rotary tools. They also work with many power drills that have collet systems capable of accepting 3mm shanks. The 3mm shank is a standard size that ensures wide compatibility across various tool brands and models.

Corundum is an excellent abrasive material known for its exceptional hardness (9 on the Mohs scale, second only to diamond). This makes corundum grinding stones highly effective for working on hard materials like jade, metal, and stone. They maintain their cutting ability longer than softer abrasives, provide consistent performance, and are less likely to clog with material debris during use.

Yes! These versatile corundum grinding stones work effectively on both wood and metal, as well as many other materials. For wood, they're excellent for carving, shaping, and smoothing. For metal, they work well for deburring, shaping, and light grinding. The same stone can handle multiple materials, though you might want to dedicate specific stones to different materials to prevent cross-contamination.

Cylinder shapes are ideal for general grinding, creating flat surfaces, making grooves, and working on larger areas. Pointed shapes are perfect for detailed work, reaching into corners, creating precise indentations, and working on intricate designs. Many craftspeople keep both shapes on hand - using cylinder shapes for bulk material removal and pointed shapes for fine details and hard-to-reach areas.

The lifespan depends on the materials you're working with and the pressure applied. Under normal use on medium-hard materials, these corundum stones can last through multiple projects. They gradually wear down with use, but the corundum material maintains its cutting effectiveness throughout its life. Avoid excessive pressure and overheating to maximize their lifespan.