Cork Lined 2 prong Clamp with swivel Bosshead 11cm 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 application2 prong cork lined clamp attached to stainless steel rodCork lined prongs provide a cushioned slip resistant holdComplete metal constructions thread fitted actuating jointsSwivel between Clamp and BossheadHigh Strength Alloy BossheadThe round extension arm allows the clamp to be rotated 360 degrees as well as vary the distance from the support apparatus.Dimensions:-Maximum clamp opening is 11cm14cm Stainless Steel Connecting RodCompletely metal constructions Thread fitted actuating joints10mm diameter connecting rod Boss accommodates up to diameter18mm rodCaution:Due to the cork lining it is not recommended that the prongs of the clamp are placed in direct heat.