Newest Design Lockin Pin for Fitness Machine, Aluminum, Big Spring Ring, Stroner Magnet. Quality Higher and Best Performance. ... magnet, easy to operate, but better preformance.Using thicker spring and big rings, more stronger during usig.Finish: Zinc ... Nickel plated. Our factory is the most professional in Fitness Machine Accessories, already cooperated with ICON, KAMWAY, ATHLETIC, TECHNOGYM, etc ...