This steel ring clamp has a 6 inch outer diameter ring which can be rotated and locked at any angle. The inner diameter is 5.25 inches. Length is 9.5 inches; 6 inches from center of ring to center of bosshead. Set screw is nickel plated steel.
Ring clamps connect to a ring stand with a multitude of uses: holding a separatory funnel, beaker, or flask.
