Catalog Number: UC77 For 5/16" to 3/8" (8 to 10 mm) Thick 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 Use Monolithic Tempered Glass CRL Standard Fixed Panel U-Clamps mount directly to the wall, ceiling or floor to secure vertical fixed glass panels. Clearance between the glass and wall is from 5/32" to 3/16" (4 to 5 mm). Clear silicone can be used to seal the gap and provide a clean, water resistant appearance.