Reiner Cast KnifeDDP Elite USA Reiner Cast Knife is crafted for use in a variety of scenarios, usually post operative. In order to keep the bone in the orientation that is required during the healing process often repaired fractures of the arm and leg are often placed in a cast. The cast can be made from a plaster material that requires a serrated edge specifically designed to cut through it as can be found in this cast knife. Additionally this instrument is 7" long