Master Mechanic, 3", Coarse, Carbide Grit-Edge, Bosch T Shank Style, Jig Saw Blade, 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.