Premium 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-metals. Processing hardness up to HRA85. Great Work EfficiencyUsing these rotary burr set with a rotary tool, the processing efficiency is ten times higher than the manual file tool. The rotary burr set can take place of the small grinding wheel with the handle, producing less dust or pollution. User FriendlyThe 10pcs metal rotary burr set comes in a neat carrying case for easy access and convenient storage, no need to organize always keep neat. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.