Description: Made of high quality high speed steel for long lifes and exceptionally precise cuts the first time, saving your energy and stress 20pcs of most commonly used routers bit types including straight, trim, V groove, beading, cove, slot cutting and more to meet your different needs. Great for all types of detail work in both Wood Working User friendly design and easy insertion process for longer life, incredibly easy to use. Accessories for fine detail work on Wood A valuables addition to any woodworker's rotary tool, suitable for most rotary tools. Suitable for most Wood, made from high quality carbide for a precise, easy cutting experience Large capacity chip grooves, and spiral cutting edges sharp, greatly enhance the efficiency and quality of products Specification: Material: High Speed Steel Size Chart: 0.31cm/0.12inch 3.9cm/1.54inch Package Includes: 20Pcs Engraving Bits Note: Please allow slightly errors due to manual measurement and different monitors.