U-Channels U-channels secure glass into position and create a continuous, minimal profile that allows the maximum amount of natural light to enter the space. Dry 11/16" x 1-5/8" U-Channel (UCD-0687x1625) Dry 1-5/8" x 1-5/8" U-Channel (UCD-1625x1625) Dry 1-5/8" x 1-7/8" U-Channel (UCD-1625x1875) Wet/Dry 1" x 1" U-Channel (UWD-1000x1000) Wet/Dry 1.5" x 1" U-Channel (UWD-1500x1000) Wet/Dry 2" x 1" U-Channel (UWD-2000x1000) Wet/Dry 1-3/4" x 1" x 2-5/16" U-Channel (UWD-HAT-1750x1000)