Usage Tips:Preminum MaterialMade of high quality tungsten steel, can be used to process: iron, steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, and marble, jade, bone and other non-metal. Processing hardness up to HRA85High Work EffenciencyThe processing efficiency is tens of times higher than the manual file tool, and nearly ten times higher than the small grinding wheel with the handle. Basically the potary burr set can take place of the small grinding wheel with the handle, no dust and pollution are created.Great Processing QualityAfter carving, the surface is smooth, the carving tool can even process a variety of high-precision mold cavities.Long LifespanThis grinding head is easy to use, safe and reliable. Durability is ten times higher than high-speed steel tools and more than 200 times higher than the small grinding wheels.Portable PackageThe 10pcs metal rotary burr set is packeged in a small case(2.3*3.9*0.6inch), no need to organize always keep neat. Suitable for engraving, beveling, chamfering, grooving, reaming, hollow.