Hook to eye turnbuckle 6mm made of heavy duty stainless steel. The hook-to-eye adjuster will adjust from 140mm to 200mm. Turnbuckles or straining/rigging screws are commonly used to properly tension cables, ropes and rigging systems on boats, such as mast and sail rigging, safety lines, as well as various other deck hardware. Eye diameter: 6mm, inside hook: 10mm, body length: 90mm.