Master Mechanic, 2 Pack, 6" x 6 TPI, Bi-Metal Reciprocating Saw Blade With Cobalt, 1/2" Shank, Plaster Straight, Shatterproof Bi-Metal Construction For Flexibility, Cobalt Content With The Matrix II Cutting Edge Reduces Heat & Wear Resistance, Has Straight Teeth For Fast Cuts In Plaster.