... for Gym Machine, Aluminum, Big Spring Ring, Stroner Magnet. Quality Higher&Best Performance Newest Design Quick Release Locking Pin BLB56For various kinds ... strong magnet, easy to operate, but better preformance.Using thicker spring and big rings, more stronger during usig.Finish: Zinc plated ... cooperated with ICON, KAMWAY, ATHLETIC, TECHNOGYM, etc. Any inquiry welcome!! Quick Release Locking Pin