A cool tool for roofers is the Primegrip Knuckle Saver knife. The handle is made so that your fingers are protected when cutting. The handle is made of aluminum - which means the knife is lightweight, yet strong. The blade is stainless steel. It's sharp, durable, and not afraid of rust. The knife is 8 inches long, which is the optimal size for most roofing jobs. Not too big to get in the way, and not too small to be inconvenient.