The Chaya Kingpin is made of steel and is compatible with both the Chaya Shiva and Ophira plates. The Kingpin is designed with a 3/8" thread and comes in a two-pack. Installation is easy, making it simple to swap out and effectively maintain the skates. These replacement kingpins are designed to be durable and reliable, so your skates will continue to perform at their best. It only takes a few minutes to replace the kingpins, so you can get back to having fun on your skates.