A set of step drill that has good quality and works great in boring hole. Perfect to add them to your toolbox.
Features: An essential hardware tool for woodworking using. High-speed steel, high quality with good durability for you to use. Professional drill for deburring, chamfering, elliptic hole enlargement. Suitable for punch holes through sheet metal, steel plate, aluminum plate, brass or wood. This drill bit set includes 3 sizes(4-12mm, 4-20mm, 4-32mm), which meet your different needs perfectly.