Burette Clamp (Alloy, Ni/Cr plated) Burette Clamp (Alloy, Ni/Cr plated)Self-closing jaws clamp the burets in rigid, upright position without obscuring graduation. Die-cast,high strength alloy.CB170-30 DoubleCB170-31 Single Burette Clamp (Alloy, Ni/Cr plated)