Ductile iron construction for added durability; Heat-treated for extra strength reinforced at stress points for longer life; Precision-located degree scale, star, arrow and rim notch for perfect bends every time; Markings raised and cast into bender body on both sides for easy visibility; Deeply serrated step helps prevent slippage when applying maximum leverage; Grooved internal hook surface helps prevent conduit from slipping; Flat hook surface provides stable starting point; Lifetime replacement guarantee