This clamp holder is cast aluminum with steel clamping screws. Accepts rods up to 21mm diameter. Overall length with thumb screws completely in is 4-1/8 inches.

  Use this lab stand clamp holder to attach smooth rod clamps such as a Use a 3-Finger Clamp (sold separately) for attaching to support stand rods., (sold separately) to a vertical lab stand rod such as such as our lab/support stand.