The Rock Solid range is made from top quality stainless and finished to Matrix Innovations usual high standard. The tube diameter is 16mm and the solid used for the bank stick tops and the heads on the buzz bars is 20mm. This is more chunky than normal which makes for an extremely sturdy set up, however it does not result in much of an increase in weight. The bank stick threads on the snag bars are set in 1" from either end so that when your indicators drop they don't smack into your bank sticks!