Troemner Talboys 2-Jaw Single Adjust Extension Clamps are designed to securely hold laboratory glassware and apparatus. Extension arm attaches clamp head securely and offers easy positioning in the deepest fume hoods. Clamps are constructed with round extension arms, which allow the clamps to be rotated 360°. Extension arms also allow placement of apparatus at various distances from lab-frames without compromising the integrity of your experiment. Nickel-plated zinc construction. Supplied with non-slip vinyl sleeves, and for temperatures above 100°C, fiberglass covers.