This four-prong, vinyl coated clamp accepts items up to 85 mm diameter. The screw adjustment allows for precise pressure when gripping glass objects, to avoid potential breakage. Constructed from powder-coated high grade zinc alloy with a non-toxic powder finish, non-ferrous, rust free and long lasting. The clamp is attached to a stainless-steel connecting rod, 140 mm long and 10 mm diameter. The prongs are coated in vinyl allowing a strong, slip-free hold and ideal for higher temperature applications. Ideal for beakers, Erlenmeyer flasks, test-tubes, boiling flasks and burettes.