【Multi-Purpose】Carbide burr set is widely used in metal processing, tool making, engineering, model engineering, wood carving, jewelry making, welding, chamfering, casting, deburring, grinding, cylinder head transplanting and engraving 【Double Cutting Design】The grooves of the engraving drill bit are cross-shaped, which is more suitable for relatively low-strength objects such as wood, plastic and aluminum 【Long Service Life】The service life of the carbide rotary file grinding head is 10 times that of high-speed steel and 200 times that of the grinding wheel, which is durable and stable 【Wide Adaptability】The 1/4 inch hexagonal shank can be fixed by any rotary tool with a three-jaw chuck for precise centering, which is ideal for engraving, carving and polishing 【Suitable For Most Tools】The double solid carbide burr set is suitable for most small rotary tools, woodworking drill bit engraving, making it easier for engraving enthusiasts to complete woodworking Specifications: Product type: double-groove hexagonal shank titanium-plated rotary file Material: carbide Handle diameter: 1/4 Inch hexagonal handle Length: 64mm Blade length: 8mm Blade diameter: 5.77mm