Stanley CB199 4.5" x 4.5"For use on heavy weight doors or doors where high frequency is expected such as entrance doors to office buildings, stores, public buildings and corridor entrance doors to offices All hinges have template screw hole location for use on either wood or hollow metal doors and frames Concealed bearing is maintenance free no oil, no grease Pins in non ferrous hinges are stainless steel Hole in bottom tip for easy pin removal Reversible flush tips and pins