The puzzle is designed for Hitachi cutting speed, coarse abrasive materials. It is specially designed to see through 1/4-inch to 3/4-inch fiberglass-reinforced plastic (FRP), 1/4-inch to 2-3/8-inch cement bonded particle board and fiber cement (or hardiboard). This jigsaw blade is 4 inches long and has 6 teeth per inch on the cutting blade is carbide tip for increased durability and reduced drag. This product is 3 for each package, and is backed by a 5-year limited warranty gives the original purchaser. Fast denomination of abrasive materials, FRP 1 / 4 "to 3 / 4" cement bound particle board 1 / 4 "to 2-3/8" fiber cement (HardiBoard) View each