Place the Reelax rod holder swivel in your existing straight rod holders. Without lifting the rod from the rod holder, just swivel the rod into position. Great for multiple hook ups, just leave the rod in the rod holder while the angler and skipper fight on, and the tip of the rod follows the fish . Suits from 40 to 50mm diameter straight rod holders. Overall length of swivel is 57mm. Made from 316 Grade stainless steel.