Shower glass notches are "hill-shaped" cutouts made during the glass fabrication process. These glass notches ready the shower panels for installation with metal clips, not U-channels. These two-inch heavy metal clips slip into the shower glass notches for a firm, secure grip.
The notches are cut to specific measurement and placement with no room for error.
Other special shower glass cutouts include the mickey mouse notch, used to secure door hinges.
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