I have an older set with the Big Block extenstion which provide 82.5 to 130lbs. Different attachment system and no longer the smooth 5 (or 2.5) pound jumps but solid enough. I'm not a big dumbbell guy so they are secondary for me. If I was pushing weight and more into dumbbells then IronMaster with the extension kits are better there (no where as convenient for 80 and below though. Choose one or better is to own both!