3-1/2" Bi-Metal Hole Saw with Attached Arbor (MHSA56C) by M. K. Morse®. Latest sawing innovation replaces all current Morse bi-metal hole saw solutions into one, simple optimized powerhouse. If you’re looking for a reliable solution to complete your project, this 1st-grade product is right up your alley. Designed utilizing the finest materials, it delivers unmatched levels of durability and strength needed to provide long-lasting service life. Superior in functionality, it will help you make any job easier and faster.