This mandrel can be installed on the Ruger Moon Clip Loading Tool (#18751) to simplify loading and unloading of rounds in the moon clip. It is made of aluminum and is .510Ē in diameter. This mandrel is designed for use with TKô Custom Moon Clips (#18737) and Ruger Moon Clips (#90515) for the Ruger Super Redhawk, 10mm, 6-round. Note: 90515 Moon Clips may have a small burr inside of the center that must be removed to utilize the mandrel and loading tool. Made in the USA by TKô Custom.