●Used to hold almost any type of apparatus and glassware with non-slip rubber coated jaws ●Build-in Boss Head Holder: attachable to a lab frame or other apparatus ●Dual Adjustment Screws: provide precise pressure regulation and reduce chance of glassware breakage ●Overall length of 270 mm (10.63 inch); maximum grip size of 90 mm (3.54 inch) ●Guaranteed after-sales service: if received defective or damaged item, please contact us. We will definitely help you solve the problem until you are satisfied