This 2-prong double adjustable universal clamp features die-cast metal construction with vinyl-coated prongs designed for maximum traction and grip. Adjustable thumbscrews on both sides provide a wide range of accommodation, and the clamp accepts apparatus up to 2.15 inches (55mm) wide. The overall length is 8 inches. The attached swivel boss head fits rods up to 21mm in diameter. Ideal for use with straight-sided items including burettes, test tubes, and flask necks in laboratory experiments.