Leland's Lures Loc N Knoc Lure Retriever - Save your favorite lure from becoming part of the bottom structure with the Leland's Lures Loc N' Knoc Lure Retriever. Simple to use, the Loc N' Knoc slides onto your line, locks in place, then you simply slide it down the line and free your lure. Frees lures stuck on structure; Locks in place on your line; Easy to use;