Master Mechanic, 2-7/8" Fine Scroll 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.Made of heat-resistant steel with tungsten carbide particles which eliminates premature dulling compared to conventional blades. Blades cut on the push and pull stroke for a smooth, clean finish. Specially designed to cut fiberglass, ceramic tile, laminates and composites.