This GonG holder consists of a tapered 12mm graphite head to hold a 12mm male joint. The custom handle is 10mm (3/8") stainless tube tapering to a 6mm (1/4") mouthpiece. The overall tool length is 273mm (10-3/4"). Heat, chemical and flame resistant handle cover included. NOTE: This holder will hold any 12mm male GonG joint, and will completely protect the ground area of the joint.