Turnbuckle Stainless Steel Stainless steel double hook buckle The item pictured is a fitting called a "turnbuckle." Information about the turnbuckle is as follows: Function: It is a tool used to adjust the tension of wire ropes, reinforcing bar bracing, etc. Structure: Threads are cut on both ends of the metal body, and the tension can be tightened or loosened by rotating the body. Types: Depending on the shape of both ends, there are types such as "frame turnbuckle (double hook)" and "frame turnbuckle (double eye)." Uses: It is used in various applications such as tightening and supporting maritime cargo, tightening formwork, and fixing signs and antennas. Set of 4 metal hook spanners, highly durable and reliable. - Quantity: Set of 4 - Material: Metal - Type: Hook Thank you for viewing. This is a used item. Please check the photos. The screws turn forward and backward, and I have confirmed they work.