Bait doesn't tear up as easily or bunch up on the hook possibly causing issues with a good hookset.

This. A senko will last me 2-3 times longer using the keeper vs putting it straight on the hook.

ok, well, maybe I need some. Thanks

thats a pic on a add from china or korea, you can find all kinds of stuff wrong with their pics, Ive seen them advertise spinning reels and had a person holding the rod up side down.

i dont think anyone uses them like that on that hook it would not come thru the grass as well as a twist lock type hook

This.

You would best use the Screw Lock on a hook that does not have the off set.

I've seen some pics that show the hook eye screwed on to the keeper.. that's why I ask.

Chinese factories produce goods they often do not understand. A lot of knock-off copying goes on there, which is how some end up making an item they don't understand very well. They put a few people in the L.A. area to handle a warehouse to receive the goods from China. This way they can offer "US based" or "Ships from US".