From the Manufacturer USA M.K Morse RB65006CT 6" x 6TPI Scrolling Bi-Metal Wood Recip Saw Blade 5pc Technical Details 8% Cobalt edge offers more wear resistance Matrix II cutting edge has shock resistant teeth that resist strippage Available in a variety of blade thicknesses to meet flexibility and rigidity needs for different aplications Electron beam welded the Matrix II cutting edge to control the process and guarantee quality MK Morse Bi-metal Reciprocating Saw Blades. Over the years we have developed and refined a special manufacturing process designed to legthen blade life. These are the blades good enough to be called Morse. These extra-tough, professional quality blades are available for a wide variety of uses in wood, metal, plastics, fiberglass, plaster and other common building materials. We electron beam weld the Matrix II cutting edge to the backer so that we can control the process and guarantee quality. Fits all popular reciprocating saw machines.