CRL Flush Mount Glass Cap Assembly work with eight different Column or Arch Swivel Fittings. Each Cap is supplied with all necessary gaskets. Fittings are tightened with a 6 mm Allen wrench (not supplied). CRL realized that, depending on the use of the Swivel Fitting, different glass attachments might be needed. Many times glass in the horizontal position is used as a counter top or shelf where a flush surface is desired. For this application use our Flush Style Attachment Caps. Other times flush surfaces are not needed, and a Surface Style Attachment Cap will suffice. Glass fabrication costs are reduced with the Surface Style Glass Attachment Cap because no countersinking is required.