This Universal Stand is a tube holder made of robust plastic for holding D-series electron tubes. The stand has a wishbone 360° rotating clamp made of heat-resistant plastic and two base holes for affixing the Teltron Helmholtz Coils D. The stand is on rubber feet to prevent it from slipping.Specifications:Dimensions: approx. 230mm x 175mm x 320mmWeight: approx. 1.5 kgThis product is required in order to operate Teltron Tubes and Helmholtz Coils.