Baluue Retort Stand 3pcs Lab Support Iron Ring Retort Clamp Set for Chemistry Physics Lab Work: Amazon.com: Industrial & Scientific
Shop OLYCRAFT Lab Stand Support Retort Ring Set 60mm 80mm 100mm Iron Lab Support Ring with Boss Head for Chemistry or Physics Laboratory Work for Jewelry Making - PandaHall Selected
Iron ring (laboratory) - Wikipedia
Cast Iron Ring, 5.75" (5.125" Inner Dia.) - Open Boss Head Clamp, with Thumb Screw - Eisco Labs: Amazon.com: Industrial & Scientific