Our Universal Clamp is a superb clamp for holding all your glassware from Test Tubes to Burettes.Clamp rotates a full 360° and can be locked at any angle. Independent adjustment screws allow a wide variety of unusual shaped items to be securely clamped. Cork lined jaws open from about 3/8" to over 3". Accepts rods up to 3/4" diameter. Overall length is 9".