This 4-prong laboratory clamp features vinyl-coated prongs that provide a strong, slip-free hold on apparatus measuring up to 8.5cm (3.4") in diameter. The clamp body is made from solid zinc die-cast construction with a high-grade, non-toxic powder coating that is non-ferrous, rust-free, and designed for long-lasting use. The clamp is attached to a stainless steel connecting rod measuring 5.5" in length and 10mm in diameter. Thread-fitted actuating joints allow precise pressure adjustment when gripping glass objects to avoid potential breakage. The round extension arm allows 360-degree rotation and variable distance from the support apparatus. Ideal for securing beakers, Erlenmeyer flasks, test tubes, boiling flasks, and burettes.