●[Material] - Carbon steel construction Labs Clamp with a Lab Clamp Holder. ●[Protection] - Wrapped jaws can well protect your glassware from scratching. The coating can bear 100℃ / 212℉ in a short time. ●[Adjustable] - 4 jaws lab clamp, holds irregular shapes easily, Opening Range: 15-80mm. ●[Easy Use] - Screw adjustments, you can adjust the jaw width you want easily. ●[Applications] - Great for holding the flask, glass tubing, burette, separating funnel and other glassware in the laboratory, science classroom and home.