This heavy duty stainless steel clamp is versatile and easy to use in the lab. It comes with chemical resistant PVC coated jaws, each with their own thumbscrew for versatility in tightening from both sides. The boss head is able to accommodate up to a 21mm rod and has its own thumbscrew for accurate and stable tightening.<br><br><b>Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control.</b><br> Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.