CST-325 Heavy Duty Tensioner for Cord Strapping. Acknowledged to be the bestÂ woven and composite strap tensioner. Easily cuts all cord types. Heavy duty cutter allows cutting strap without tension and extends the cutter life. Industry one of a kind patented windlass return mechanism for faster and easier strap loading. Innovative gripping mechanism grips and releases strap with a vertical motion without damaging it. Most user friendly and ergonomically appealing poly strapping tensioner.