This screw hook from Onward is ideal to correct your gate's sag. It's made of steel and has a safe working load of 100 lb.
Hillman Black Coated Durasteel Heavy Duty Screw Hook Size, 1/4 in. x 4-1/4 in., 320123 at Tractor Supply Co.
Buy Wekboss 2 Set Metal Beam Hook 1 Inch Stainless Steel C Clamps and Heavy Duty Hanging J Hook/Threaded Screw Hook for Garage I Beam: Screw-In Hooks
Wekboss 2 Set Metal Beam Hook 1 Inch Stainless Steel C Clamps and Heavy Duty Hanging J Hook/Threaded Screw Hook for Garage I Beam
Screw Hook - Onward Hardware
Hardware Essentials 851912 Zinc-Plated Gate Screw Hook, 1/2 x 4 Inch, Silver, Pack of 1 : Industrial & Scientific
Screw Hook with Lag Thread - Onward Hardware
Simpson Strong-Tie #12 x 5-1/2-in Double-barrier Outdoor Accents Exterior Wood Screws (12-Per Box) in the Wood Screws department at
Rope Hook - Onward Hardware
Hillman Hardware Essentials Heavy Duty Screw Hooks are great for hanging items through out the home. Curved lip helps prevent items from falling off hook. Available in zinc, brass and stainless steel finish. Available in different sizes. Do not use to hang or lift loads.
Hillman 3/8 x 4-1/2 in. Zinc-Plated Heavy Duty Screw Hook 851881
Simpson Strong-Tie #9 x 2-1/2 in. 1/4-Hex Drive, Strong-Drive SD Connector Screw (100-Pack) SD9212R100-R - The Home Depot
Hooks & Hangers - Onward Hardware
Buy Onward 93112XBC Screw Hook, 4 in L, Steel, Zinc
The durable stainless steel assembly ensures reliable and sturdy support with corrosion resistance and gives an industrial appearance to a variety of interior and exterior living spaces. A sharp point allows these Hardware Essentials stainless steel heavy-duty screw hooks to easily and rapidly fasten into smooth or predrilled wood studs.
Hardware Essentials 1/4 x 4-1/4 in Stainless Steel Heavy Duty Screw Hook 10-Pack 851879