The ISF Axle Ez Curl Bar is olympic sized 2" through the sleeves barbell....and the whole bar. This fat 2" grip allows for increased wrist and forearm development. Our Axle EZ curl bar features very pronouced bends so you really get the best hand angle grip at all three grip positions. Reverse your grip for an even more forearm centric arm blast. This barbell is 47" long and weighs about 17.5 lbs. The sleeves are just shy of 8.75" loadable area. Your typical 2" collars (not included) will fit the bar. There is no need to shell out additional monies for specialty bar or Axle collars.