Husqvarna's H21 is a fast cutting .325 pitch chisel chain with the smooth performance of a low vibration bumper drive link. With the Razor sharp chisel cutters it makes quick work of both hardwoods and softwoods. H21 works best in clean cutting conditions, where there is limited contact with dirt and other abrasive material. Recommended Saw Sizes 2.3-3.8 cubic inches (38-62cc)