It is a simple bodyweight exercise device, consisting of two separate pieces like the ones in the picture.
Exercises performed on it:
Dips to strengthen the chest and triceps
Push-ups at a different angle
L-Sit for abdominal training
Balance and calisthenics exercises
Its features:
Sturdy and suitable for home training
Easy to move and store
Withstands high weights
Suitable for beginners and professionals