5/16 x 3/4 (.020 gauge)-Typical Standard Frame Size on Most Windows

5/16 x One-Inch (.024 gauge)-Heavy Duty .024 Gauge (Recommended for Solar Screens)

3/8 x 3/4 (.020 gauge)-Some Window Tracks Are This Size, Use If Your Window Tracks Are Wide Enough

7/16 x 3/4 (.020 gauge)-Even Thicker Frame for Some Windows With These Extra Wide Tracks