The difference between the dimensions should be assessed in the context of the entire rig. Compare the gauge of the swivel to the line, the connected elements and the location the snap occupies. Don't assume that the larger option is automatically the right one. Load capacity is not specified, so do not assign any size value on which to base your choice.
In long-distance feeding and deep work, roller sections take the rotation between the individual parts and thus limit its carrying along the line. This does not override careful pre-release arrangement. If the leader is already twisted or the snap is hooked up crooked, the swivel cannot compensate for any mistake made.
The snap must accept the selected binding element without pressing and close completely. After hanging, inspect it from all sides, because partial closure easily goes unnoticed. Also check if the roller links move freely without the line being passed through an incorrect ring or resting on an adjacent part.
After use in salt water rinse the swivel with fresh water, dry it and re-check the movement and closure. Do not put a ready-made rig with the putty or leftover salt around the roller sections. The right size, clean connection and a good working snap are the three practical conditions for this accessory to fulfill its purpose at the next outing.
To see the adjacent directions around the mark, open All products and figure out what else ties in with the prepared tackle. When you get to the connecting elements, compare Swivel and hangers with the more specific marine category Swivel and hangers for sea fishingwithout mixing up the different fishing situations.