Decent squat bars are usually 55 lbs. However, if you compare one to a regular 45 lb or 20kg bar (for example, a texas power bar or an ivanko), there is no mistaking one for the other. A squat bar is usually a little longer between the sleeves, the sleeves are a little longer and the bar is noticably thicker. If you put 700 on a 55 lb squat bar it will just barely flex andwill have very little whip to it. A 45 lb bar- especially an Ivanko- will whip like a motherfucker with that kind of weight.