MK Morse TACPD4 4-5/16" Hole Saw Drill BitAt The M.K. Morse Company we"ve had just one focus for over forty years ... make better saw blades and accessories and get them to customers on time. We don"t make machinery. We don"t make other products. We do one thing and we do it very well. This single-minded devotion has led to some unique innovations over the years. Mostly it has led to a relentless march to improve value.MK Morse TACPD4 4-5/16" Hole Saw Drill Bit Features:; High speed steel; Use with TA series hole saws; Use in wood, plastics, aluminum, brass, cast iron, stainless steel, or any machinable metal; 4-5/16" overall length; Carded