The Olympic EZ curl bar with collars is for use with Olympic weight plates with a diameter of 2" (5cm). Target your arms & build up tone & strength with this great piece of gym equipment that is made from solid steel & features a chrome finish to enhance its durability. This weight lifting bar weighs 8.3kg (18.3lbs) & is supplied with spring collars to secure weight plates in place. Grip the bar with complete confidence thanks to the knurled handles.