D-Ring aids are ideal for use in the gym. They allow attachment directly to the karibiner on gym equipment such as cable and pulley machines. This gives the benefit of a greater range of movement as well as pulling directly from the wrist. D-Ring aids are beneficial for both those with weak hand function and those with limb differences. They allow direct attachment to the karabiner on gym equipment such as cable and pulley machines, giving you a greater range of movement. The price is for a pair of D-Ring aids - left and right hands. Which size? Standard size fits a wrist circumference of 5.3"-7.2", large fits 7.1"-8.7". Items should arrive within 3-4 weeks.