Olympic Super Ez Curl Bar 52" & Spring CollarsThis Trojan Olympic Super EZ Curl Barbell will allow you to use Olympic plates that have a 2" 50mm inch diameter hole in them, with a maximum weight of 300 lbs, so you'll certainly be able to use this to the best of its ability. Even better, the top entry in our list of best Super EZ curl bars is solid. Suitable for 50mm Olympic Plates Ball Bearings and brass bushings Length 1200 28 mm Grip Includes pair Spring Collars Excludes Rubber Floor tile