Ultra cutter made of high speed steel. Lasts 10 times longer than standard hole saws. Precision-ground teeth cut smooth, burr-free holes with ease. Durability and speed provide low cost per hole. Split-point pilot drill prevents “walking” – makes accurate hole placement easy. Spring-loaded slug ejector saves time. No tool required to change cutter sizes. Less chance of broken teeth because the saw body is machined out of solid, high-speed steel.