The high speed steel cutting blade adjusts to accommodate the thickness of your material and is easily replaceable. Body constructed from heat treated tool steel; cuts circles from 7/8 in to 4 in in diameter. All adjustments can be made with hex wrench (included). For use on a drill press only; replaceable cutting blade and 1/4 in pilot drill (replacement blade #4/5). Used in applications such as cutting through most materials, including wood, composite, sheet metal and more.