3/8" Channel Depth - 19/64 Metal Opening Made Especially for Use in Shower Doors This CRL Glazing Vinyl is made especially for use in shower doors. The channel depth of the vinyl is 3/8 inch (9.5 millimeter) and it requires a metal opening of 19/64 inch (7.5 millimeter). Channel Depth: 3/8 in (9.5 mm) Metal Opening: 19/64 in (7.5 mm)