Wrap Pins are neat Velcro locking devices used to secure turnbuckles without messing with unruly cotter pins. Just make your adjustment, push the cotter attached to the Velcro through the hole and wrap the Velcro strip around the turnbuckle body.
Works on open body turnbuckles and Johnson's positive locking, slotted tubular turnbuckles.

Two sizes work on 5/16" - 1/2" threaded turnbuckles
Sold two per package