Magnesium cast handles for maximum strength and minimum weight. The total weight of the M1-12 is only 13.4 oz. (0.42 kg). Enlarged ergonomic designed handle bows that are contoured to fit the user's hand comfortably. The high carbon steel replaceable blades of the M1-12 feature a hollow ground edge for superior cutting performance. The M1200 can cut a multitude of sheet materials including sheet metals, asphalt shingles, vinyl, screening, cardboard, and many more. The M1200 has been designed to make blade replacement quick and easy. There are no rivets or special tools required. The M1-12 has also abeen designed to comfort the user's hand. The ergonomic design of the enlarged handle bows is contoured to fit the user's hand comfortably.