Master -Li multi-functional four-jaw adjustable clamp is called multi-functional universal clamp. Due to the proprietary design – this clamp can be attached directly to the iron rod of the tripod without a separate cross clamp. In the middle is the steering structure, which can be more convenient to set up and more flexible during the experiment. The clamp has a cork gasket inside. This design is more convenient and does not slip when clamping glassware, with too much force to break the glass tube is not easy.