Unsupported, that is.
Via Napalm's Corner : Chad Woodall (interview) won this year's Munsterland Grip Challenge (Jedd has the top 10 placings), and after watching this video, it isn't difficult to see why.
Pinching 3 x 15kg plates, without anything (such as a pipe through the middle) holding them together [streaming, 1.2mb .flv download]. Amazing.