Turnbuckle

[1] Turnbuckles are most commonly used in applications which require a great deal of tension; they can range in mass from about 10 grams (3⁄8 oz) for thin cable used in a garden fence, to tonnes for structural elements in buildings and suspension bridges.

Historically, biplanes might use turnbuckles to adjust the tension on structural wires bracing their wings.

In both cases they are secured with lockwire or specifically designed wire clips to prevent them from turning and losing tension due to vibration.

A variant of the turnbuckle called a bottle screw features an enclosed tubular body.

A type of splint is used for upper limb to produce gradual stretching over contracted joint by its turn buckle mechanism.