ProBell 30 Classic offers state-of-the-art performance in a compact, precision engineered free-weight system. ProBell's 304 stainless steel knurled bar provides structural rigidity and gripping power combined with long term beauty. The ProBell system's internal cam shaft allows for fast and easy adjustments in five pound weight increments.The adjustment dial helps to simplify your workout by allowing you to add or release weights with a turn of a dial. With each dial turn, you will add or release two 2 1/2 pound weights. To properly add or release weight plates, position the bar and all weight plates in the tray. Make sure that the dial on the bar is positioned at the contoured end of the tray. To add weights, turn the adjustment dial clock-wise. To release weights, turn the dial counter-clockwise. This revolutionary system allows you to adjust the weight from five pounds to thirty pounds with the turn of a dial. The zinc die cast plates are e-coated for a traditional look. The ProBell system rests in a high impact nylon storage tray. The ProBell 30 Classic is designed to look great in any environment: home, office, or gym.