Catalog Number: SGCU1 For 3/8" to 1/2" (10 to 12 mm) Glass Used to Secure Fixed Panels of Glass for Frameless Shower Enclosures Solid Brass A Nice Option to More Traditional U-Channel, in that the Clamps Help the Appearance of an 'All-Glass' Look Glass Fabrication: Notch Required in Panel Use Monolithic Tempered Glass CRL Square Wall Mount Clamp (Notch-in-Glass Style) mount directly to the wall, ceiling or floor to secure vertical fixed glass panels. Clearance between the glass and wall is 1/16" (2 mm). Clear silicone can be used to provide a clean, water-tight seal.