Proloc 3 Double Chains (pair)Holds Twice the Chains Bands: Double the Fun The PROLOC 3 Collar is made from high strength nylon. These collars fIt any bar with a diameter ranging from 1. 937" to 2. 007" (Fits most bars, Fits all Olympic bars) Compatible with Olympic bars and Powerlifting bars as well as most logs, cambered bars, Swiss bars, and safety squat yoke bars. Sold in sets of TWO. It can also fit smaller bars but cannot be used as a collar, more like a chain holder. These