Material: Made of high quality 304 stainless steel, anti-rust and durable.Size: M4, M5, M6, M8. (optional)Package content: 5x turnbuckle wire tensioner hooks.Wide application: ideal for adjusting the tension or length of cables, ropes, tie rods and other tension systems. Widely applied for interior and exterior uses.EASY TO USE: Just turn it to adjust the tension when using it in clothesline, chain and guardrail cables or any other application.