From the manufacturer
Keep your bathroom looking great and free from water leaks with this M 6258 frameless shower door bottom seal. Made of clear vinyl material, it’s designed to attach to the bottom of frameless, swinging shower doors without adhesives. Use it to replace discolored and moldy shower door seals or leaky, unreliable seals. Installation takes just minutes and doesn’t require adhesives or other additional products. The shower door bottom seal fits a 3/8” x 36” swinging shower door, but can easily be cut to fit a shorter door with a hacksaw, tin snips or utility knife. The genuine Prime-Line part will have an insert showing “M-6258” & “Prime-Line” clearly printed on it. Some third party sellers are shipping a different version with a shorter fin. For alternate design, see also Prime-Line’s model number M-6264.
From the Manufacturer
This shower door bottom seal is constructed from clear vinyl. It features a slip on design requiring no adhesive and a 36 in. length that can be cut to size. This style seal is used on frameless shower doors and fits 3/8 in. thick glass.