The adapters allow fitting of Strep-Tactin^® TACS Agarose columns onto standard tubes. Column adapters are available in two sizes: for  0.3 ml Strep-Tactin^® TACS Agarose columns to fit them onto 15 ml tubes and for 1 ml Strep-Tactin^® TACS Agarose columns to fit them onto 50 ml tubes.