Global Door Controls 4.5 in. x 4.5 in. Bright Chrome Steel Spring Hinge - Set of 3 4.5-Inches by 4.5-Inches Steel base material Template screw hole locations Packed with both wood and machine screws Meets NFPA 80 for 3 hour fire rating Conforms to ANSI/BHMA-K81071F for self closing hinges