Bender head has easy visibility markings that are raised and cast into both sides. It has a deeply serrated steps and grooved internal hook surface that prevents slippage, while applying high leverage. It is heat treated for extra strength and reinforced at stress points for longer life. Uses the Benfield bending system, which is standard to the industry, resulting in accurate and dependable bends. Includes convenient bending guide as a reference for basic bends. Withstands a lifetime of heavy use. Exceptional, durable, materials for extra strength, and reinforced at stress points for longer life. Ductile iron material is stronger than malleable iron or aluminum.