If you're building a new boat or replacing turnbuckles on your trailersailer, consider these top-of-the-line turnbuckles. Instead of the classic tubular style, these turnbuckles jaw/jaw turnbuckles are slightly open so you can see what's going on inside. And with C.S. Johnson's easily adjustable Positive Locking Rings, there is no more need for cotter pins and nothing to catch on lines, sails or shins! And the Locking Rings are captive so can't be lost overboard.