3" Closed Ring with Boss Head Clamp, 5" Long

The Eisco Labs Closed Ring Clamp features a 3" inside-diameter cast iron ring on a 5/16" diameter stem, paired with an open boss head fitted with a thumbscrew that accepts rods from 5/16" to 5/8" in diameter. Extension distance from boss head to ring is approximately 1.5", and the total length from the boss head centerline to the edge of the closed ring is 5". A versatile, durable support accessory for holding flasks, funnels, and other laboratory glassware on retort stands during heating, filtration, and titration work.