[TOP QUALITY MATERIAL] These rotary tool bits are made with premium carbide tungsten steel, a highly durable material which is guaranteed to withstand the test of time. With a double cut tooth angle which prevents chipping, this tungsten carbide bit set is superior to any high speed tungsten carbide burrs. [A TOOLBOX MUST] This 20-piece burr set for wood includes everything you need for cutting, shaping, grinding, polishing and removing sharp edges, being compatible with ferrous and non-ferrous metals, wood, plastic and even stone. The kit includes a massive selection of shapes for all types of cuts.[PROFESSIONAL RESULTS] Unlike similar products on the market, these carving burrs provide a faster cutting time, being suitable for cleaning trimming, veining and weld joint of casting, porting tools, forging and finishing all kinds of metal and non-metal mould.