Features and Benefits: Round serrated face is 1-1/4" diameter; Square face is 1-1/8" x 1-1/8"; Cross-grooved face for shrinking sheet metal ; Plain square face for flattening; Made in the USA; Martin auto body tools are the choice of professionals because of their superior quality. This Martin hammer features a precise-ground head with excellent balance, the proper weight, and a fiberglass handle. Fiberglass handles are becoming popular because of their comfortable grip and ability to absorb shock. All Martin Tools carry a limited lifetime warranty.