Catalog Number: BCU4 For 3/8" to 1/2" (10 to 12 mm) Glass Use Monolithic Tempered 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 Required to Accommodate Clamps CRL Beveled Wall Mount Clamps (Hole-in-Glass Style) mount directly to the wall, ceiling or floor to secure vertical fixed glass panels. Clearance between the glass and the wall is 3/16" (5 mm). Clear silicone can be used to provide a clean, water resistant seal.