stonylab3-Prong Swivel Clamp and Laboratory Cross Clamp Holder Set for Holding, Robust 3 Prong Easy Adjustable Extension Swivel Clamp and Boss Head Clamp Holder

stonylab 3 Prong Swivel Clamp and Bosshead Clamp Holder Set, Sturdy 3 Prong Single Adjust Extension Clamp and Boss Head Clamp Holder

StonyLab 2-Pack Adjustable Bosshead Clamp Holder, Lab Heavy Duty Boss Head Clamp Holder Aluminum Alloy Body, up to 16mm Rods for Laboratory Use