For 3/8" to 1/2" (10 to 12 mm) glass. Glass fabrication: 5/8" or 3/4" (16 or 19 mm) hole in panel. 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 Square 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 wall is 3/16" (5 mm). Clear silicone can be used to provide a clean, water-tight seal.