Turnbuckles are used for projects requiring a tensioning device or where a take-up in length is required. There are several combinations to choose from: EYE x EYE, JAW x EYE, JAW x JAW, HOOK x HOOK, HOOK x EYE and STUB END; you can also purchase just the body of a turnbuckle. Turnbuckles are measured by the diameter of the bolt and the length is measured by the 'take-up' which is the area inside the body. The rods on each side of the turnbuckle are screwed in opposite each other to allow for the take-up, in other words, one rod is threaded for right hand and the other rod is threaded for left hand. They are offered in sizes as small as 1/4" and as large as 2-3/4" X 24" take-up in a JAW x JAW configuration. Both galvanized and stainless steel are available, but there is more variety and take-up options in the galvanized versions. Turnbuckles have been around for many, many years and their job and their design hasn't changed. They are just another valuable tool in the rigging industry, one and they are recommended for straight in-line pulls only.