Ultra Cutter Kit. Includes 7/8" - 2-1/2" cutters, two small arbors for extended assembly to 7/8" and 1-1/8" cutters, large arbor, hex wrench and case. For conduit sizes 1/2" - 2". Lasts 10 times longer thanstandard hole saws. Precision-ground teeth cut smooth, burr-free holes with ease. 1/4" (6.35 mm) capacity. 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.