This Greenlee Ultra Cutter is made of high-speed steel. It lasts 10 times longer than a standard hole saw. It is also precision ground teeth cut smooth, burr free holes with ease. Its durability and speed provide a low cost with each hole. Its split-point pilot drill prevents walking and makes accurate hole placement every time. The spring loaded slug ejector saves time and no tool is required to change the cutter sizes. This cutter provides a less chance of broken teeth because the saw body is machined out of solid, high-speed steel.