The Decoy Pluggin' Singles are designed to replace treble hooks on lures with singles. They have an over sized and upright eye to allow for the split ring.
Many anglers prefer only having one hook in a fish, rather than a treble to contend with. Other advantages with the singles is that they allow the lure to work more freely.
I have tried other single hooks on my lures but have yet to find anything that compares with the Decoys.