UNITED SCIENTIFIC 3-Prong Extension Clamp, w/Boss Head, PVC Coated

Our deluxe line of 3-prong extension clamps are constructed of pressure die-cast zinc alloy and are chrome-plated. Prongs open to about 3", have a recommended maximum grip size of about 2.25", and feature double keyed spring-type adjustment screws. Boss head clamp can swing freely, is lockable at any angle up to 360°, and can be used with rods up to 19mm.