4 prong cork lined universal clamp on rod 10.5cm maximum clamp opening.Suitable for beakers Erlenmeyer flasks test-tubes boiling flasks and burettes. Chosen for its quality: made from a strong alloy not iron so won't rust!Clamp constructed of powder coated high grade Zinc die cast construction. High grade nontoxic. powder coating. Non-ferrous rust free & long lasting use for any laboratory application4 prong cork lined clamp attached to stainless steel rodCork lined prongs provide a cushioned slip resistant holdComplete metal constructions thread fitted actuating jointsDimensions:-Clamp accepts apparatus measuring up to 8.5cm.Maximum clamp opening is 10.5cm14cm Stainless Steel Connecting Rod10mm diameter connecting rodThe screw adjustment allows for precise pressure when gripping glass objects to avoid potential breakage.The round extension arm allows the clamp to be rotated 360 degrees as well as vary the distance from the support apparatus.Caution:Due to the cork lining it is not recommended that the prongs of the clamp are placed in direct heat.