M.K. Morse RB618T05 6-by-3/4-by-0.035-Inch 18 TPI Bi-metal Reciprocating Saw Blade, 5-Pack 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