This Klein Unibit step drill bit is well-made and versatile, with a dark oxide finish and 3/8” hex shanks. It is great for drilling through a variety of materials, and can be used to increase the diameter of existing holes in wood, fiberglass, poly-plastic, or thin sheet metal. It is also easy to carry in a hand drill pouch and can be used to cut through thin sheet metal or countersinks in wood. Customers are very satisfied with the product and recommend it.