Designed for ease of use and durability, these all stainless steel clamps are ideal for connecting glassware components to support stands. A thumb screw too worm gear adjustment allows for easy attachment. The ring is coated with a Polyolefin heat shrink to protect against damage to the supported glassware. A sturdy 3/8" (9.5mm) rod extends 4.5" (115mm) back from the ring clamp.