Features a new 3.5 TPI tooth design that offers you the longest life in metal applications. These Bi-Metal Hole Saws can take on all general purpose applications. The new slot design also gives you increased pilot visibility for accurate placement and faster chip ejection keeping your cut cool. Thermoset Coating allows for faster cutting and is optimized for cordless tools, delivering you 25 percent more holes per charge. Bi-Metal hole saws are proudly made in the USA. This hole saw kit also includes a case, which offers you enhanced customization capability thanks to the interchangeable pegs. You can store arbors, pilot bits, and more in the removable accessory box or remove it entirely to create more space for hole saws. Each Milwaukee Hole Saw Case features a reinforced grid design on the top and bottom, plus heavy-duty latches, securely storing the hole saws within this durable, hard case design.