All you need is something reliable to hang the hooks on, no tricky spring loaded clips, just straightforward solid stable hooks that don't fall off in use but are so easy to hook on to a bar. If hanging over a bar, it needs to be under 2" diameter. There is enough padding in the sling to keep it from cutting into your upper arm, unlike the 'economy' models given free with some stuff. Be aware that if you want the hooks to be wider apart, you may need to wrap something round the bar to stop the hooks sliding back in to a more natural shoulder width apart. Most folk will be too busy with their abs to worry about the effects of placing the hooks wider than shoulder width to stress their laterals...
Good price for a sound comfortable product that is well finished with just about nothing to go wrong.