An apparatus in women's artistic gymnastics with a top bar 2.4m above the floor and alower bar 1.6m high, used for a continuous series of grip changes, releases, new graspsand other complex moves.

The apparatus you're referring to is known as the Uneven Bars in women's artistic gymnastics. This apparatus requires gymnasts to perform a routine moving from one bar to the other, while executing handstands, releases, catches, and many other complex moves. The top bar is set at 2.4m above the floor, while the lower bar is set at 1.6m. This difference in height allows for the execution of spectacular release and catch moves. The gymnast's routine must be a continuous series of different moves, grip changes, and releases without any pauses or extra swings.

The apparatus you're referring to is known as the Uneven Bars in women's artistic gymnastics. Here's a step-by-step breakdown of how it's used:

1. The gymnast first mounts the lower bar, which is 1.6m high. This is usually done with a jump, spring from a springboard, or a step up.

2. Once on the lower bar, the gymnast performs a series of moves that involve swinging around the bar, changing grips, and transitioning between different positions. These moves require a great deal of strength, flexibility, and coordination.

3. The gymnast then transitions to the top bar, which is 2.4m high. This is usually done with a move called a 'release and catch', where the gymnast lets go of the lower bar, performs a move in the air (like a flip or twist), and then catches the top bar.

4. On the top bar, the gymnast performs another series of moves, similar to those on the lower bar. These moves are often more difficult due to the increased height and momentum.

5. Finally, the gymnast dismounts from the top bar, usually with a high-flying move that involves multiple flips and/or twists. The dismount is a critical part of the routine, as it's the last thing the judges see and can greatly affect the gymnast's final score.

6. Throughout the routine, the gymnast must maintain a smooth, continuous flow of movement. Any pauses, wobbles, or other breaks in the flow can result in deductions from the gymnast's score.