The heavy duty speed ring SRTB is equipped with tilt bracket to firmly support the weight of Deep Octa and Para softboxes. It can be used for every Octa, Deep Octa and Para but is specifically recommended, because of its heavy weight, for the Para 190, Para 253 and the Deep Octa 150.
For the Deep Octa 90 and 150 you can also use speed ring 4323087