This exercise pulley set comes with basic traction hardware that fits over the door and uses two hand grips suspended on two metal pulleys. It is designed to exercise upper body extremities easily and safely. It helps increase range of motion in arms while stimulating muscles and easily fits over most standard doors. Do Physical Therapy Exercises at Home Similar to those used in physical therapy offices, this DMI Exercise Pulley Set makes it easy to continue your exercises at home at an affordable price. Excellent for exercising upper arms and shoulders after surgery or to recover from injuries. Also makes it handy for anyone wanting to exercise their arms. It fits on most doors and wont get in the way when youre not using it. Its easy to install and even easier to use. Features: Comes with basic traction hardware that fits over the door. Uses two hand grips suspended on two metal pulleys.