Stand to hold jacketed bio reaction vessels. Top 2 piece ring is made of anodized aluminum while the lower ring and legs are electro polished stainless steel. Stands come complete with silicone o-ring and 6 each knurled nuts to attached the head plate to the stand. Optional stabilzer bars are available for added stability. The stabilizer bars attach to the legs of bioreactor stands with two adjustable hex head screws.Like-for-like replacement parts for Applikon Biotechnology and Broadley-James brands of bioreactors.Applikon is a registered trademark of Applikon Biotechnology, Inc. Broadley-James and Broadley-James Corporation are registered trademarks of Broadley-James Corporation.