Original pocket for Sam billiards for the pool 51 Atlatic game mode. This model is the one in the center of the table and each table has two units of this model. This pocket is for tables with a ball size of 50. It is not valid for the conventional pool model with a 57mm ball. For pools with a 57mm ball you have the other model in this section. Measurement: 9 cm wide x 7 cm high Upper frame: 10 cm wide