The SIG-33 Smith Machine is a top-of-the-line exercise machine that helps you stay fit and healthy. With its patented hook device, you can easily hook up the bar and start working out. The main frame is made of 75*118*3.0 semi elliptical pipe, while the functional area is made of 50*120*3.0 flat oval pipe. All pipes are Q235 qualified, so you can be sure of their durability. The counter balance design makes it easy for any exerciser to use, and the safety mechanism ensures that you can use it safely and effectively.