Extension Clamp (G30) The clamp is made with interlocking jaws which will allow you to hold objects from 1/8"to 3-1/2"in diameter. It can be used for both burettes and condensers. The jaws are lined with cork to insure a secure grip. The handle is an aluminum rod with a satin finish, the clamp is cast aluminum with an enamel hammertone finish. The thumb screw is nickel plated steel. Qty :