The RSQ series is a fixed-height stopper cylinder with proven endurance and low breakaway characteristics. The RSG series is an adjustable mounting height stopper cylinder. It can be raised or lowered according to the distance required to stop the work piece. The RSH heavy-duty stopper cylinder is specially designed for use on conveyor lines or other applications requiring an external stopping
Catalog: Stopper Cylinder Series RSQ Series RSG (Fixed mounting (Adjustable height) mounting height) For the RSQ12/16/20/32/40/50 and RSG40/50, refer to the “Specific Product Precautions” section in the catalog.
The RSQ series catalog can be found here. And the RSG series catalog can be found
https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://smccatalog.partbuilder.smcpneumatics.com/support/faq/en-jp/?ca_id=actuators&fa_id=10710