2 Pack, 8" x 3/4", Reciprocating Blade Alloy Steel Spring Tempered Backing, Tungsten Carbide Continuous Edge Grit Particles, Grit Hardness Ra 90-93, Fits Most Popular Reciprocating Machines, Higher Abrasion Resistance Than Bi-Metal Blades, Cuts Certain Materials More Effectively Than Bi-Metal Blades, Soil Pipe, Cast Iron, Plywood, Ceramic Wall Tile, Brick, Carbon, Fiberglass, Epoxies, Plaster, Melamines, Cement, Laminates, Marble, & Hardwood Floor.