stonylab 4 Prong Adjust Swivel Clamp, Sturdy 4 Prong Multipurpose Lab Clamp Extension Clamp with 100 mm Max Opening Lab Accessory

4 pronged with maximum clamp opening of 100 mm (3.94 inch) Used to securely hold almost any type of apparatus and glassware with cork coated jaws Constructed with extension rod, this clamp can be attached to a lab frame or other apparatus by using a boss head clamp or similar tool The adjustment screw helps provide precise pressure regulation and reduce chance of glassware breakage