Tough and long-lasting tungsten carbide - never needs resharpening. Fits all popular makes of power tools. Replaces conventional blades. Resistant to heat and abrasion. Cuts on both up and down stroke. Saws through brick, cast metals, ceramic tile, composites, cement backerboard, fiberglass, flagstone/slate, hardwood laminates, marble, plastic, plywood, PVC, and reinforced cement. Carded set includes: 6", 9", and 12". 3/4" width, medium grit blades.