RELIABILT spring hinges are designed to assure that doors close behind you. Closing speed is adjustable UL approved for fire doors Tools required: A pencil for marking, a power drill, 5/64-in drill bit, and a Phillips screwdriver Package comes with all necessary mounting hardware and installation instructions Oil-rubbed bronze finish adds charm and easily match accessories in chrome and stainless steel Limited lifetime guarantee Hardware Finish: Oil-rubbed Manufacturer Color/Finish: Oil-Rubbed Bronze Height Measurement: 4-in Hinge Thickness (Inches): 0.099 Load Capacity per Hinge (lbs.): 37 Maximum Door Thickness (Inches): 1.375 Minimum Door Thickness (Inches): 1.25 Recommended Door Thickness (Inches): 1.375 Width (Inches): 4 Commercial/Residential: Residential Hinge Tip Type: Flat Hinge Type: Spring Interior/Exterior: Interior Material: Steel Package Quantity: 1 Pin Type: Spring-loaded Radius: 1/4-in Screws Included: Yes Warranty: Limited lifetime CA Residents: Prop 65 Warning(s): No UNSPSC: 31162400