The worlds first adjustable downstem Precision machined so all the pieces fit together precisely. Anodized smooth non-stick finish, so it will always-new look. Made from Aircraft Grade Aluminum using the Latest in CNC machining technology. Comes With 3 Diffusers Comes With 18/18mm Joint & 18/14 Joint Low Profile Adjustable Length (2.5 Inch - 8.5 Inch) Unbreakable Metal