This Sea-Dog brand turnbuckle is a must-have for any sailboat owner. Made from high-quality 316 stainless steel, it is built to last and withstand the harsh marine environment. With an open body design, it is easy to access and adjust the rigging without having to deal with a closed-body turnbuckle. The 5/16" size is perfect for a range of sailboat rigging applications. It comes with the manufacturer part number 185108 and is suitable for use with a variety of sailboat makes and models. Whether you are a seasoned sailor or just starting out, this turnbuckle is an essential piece of marine hardware that you will need to have in your collection.