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What are the common types of fastening

Double J hook
Although still considered a universal tie-down end, double J-hooks or double-line hooks are generally better for securing heavier loads than S-hooks. Unlike S-Hooks, Double J-Hooks are angled at 90 degrees to the plane of the strap, allowing direct attachment to anchor points and a flat strap surface area across the cargo, preventing strap twisting. Therefore, double J-hooks are better suited for use with D-rings, O-rings and trailer sides to secure large or heavy objects such as:
motorcycles and sand tracks;
Canoes and kayaks; or
Welder and medium toolbox.
Double J-hooks are available in two-jaw, single-jaw and "swivel" variants. Additionally, J-Hooks are also available with zinc or vinyl coatings.

flat hook
Flat hooks are often used in conjunction with winches or ratchet buckles on large flatbed trailers to secure heavy and industrial loads. Flat hooks are made from a flat, square piece of steel that bends back on itself. This design enables the flat hitch to be secured in thin, flat anchor points, such as the side of a flatbed trailer or pile pockets. During transport, it is best to use flat hooks to secure:

Backhoes and excavators;
Industrial generators and engines; or
Number of guardrail sleepers and steel support beams.

snap hook
Flat hooks are Ratchet Tie Down Buckles often used  in conjunction with winches or ratchet buckles on large flatbed trailers to secure heavy and industrial loads. Flat hooks are made from a flat, square piece of steel that bends back on itself. This design enables the flat hitch to be secured in thin, flat anchor points, such as the side of a flatbed trailer or pile pockets. During transport, it is best to use flat hooks to secure:
big tent landing
Tow hitch for trailer to vehicle
The vehicle behind the trailer.