Olympic bars have a 2" diameter hole and require olympic discs. Spring collars are included. Weights not included - see our other listings! The fastest way to increase upper Arm mass, strength and definition. A proven favourite of bodybuilders everywhere, this bar isolates and intensifies development of the Bicep and Forearm muscles. Specifically angled to eliminate stress on the wrists and elbows. Length: 47" Weight: 8kg