Master Mechanic, 2-7/8" Fine Grit-Edge, Jig Saw Blade, 1/4" Universal Shank, Made Of Heat Resistant Steel With Tungsten Carbide Particles Which Eliminates Premature Dulling Versus Conventional Blades, Blades Cut On The Push & Pull Stroke For A Smooth Clean Finish, Specially Designed To Cut Fiberglass, Ceramic Tile, Laminates & Composites, Carded.