Check the listing for details. PAIR 14k White Gold Heavy 0.041" Post Threaded Screw Earring Backs Nuts USA MADE. Color: White, Condition: New with tags. Listed at 45.00 USD. 14k White Gold Screw Backs, stamped 14k Post Size: .041" 1/4" - 5.75mm pad 0.22 DWT (0.34 grams) These will not fit most lower/budget dollar earrings. DON'T KNOW WHAT SIZE YOURS ARE? These are just tips, NO guarantees. Most BIG Name Brands or high dollar ones will be .041. And some use even larger. Returns will be deducted for original shipping cost. 20 Gauge will just barely fit through a .041" back. If it doesn't fit, yours are likely .032". 22 Gauge will fit through .032" Household ways to find the size are 20ga sewing needles, earrings/piercing or electrical wiring(bare Copper/Stripped) that you know the Gauge size to. or If you have some regular push backs, they are typically only .032". If they are able to go thru your screwback, your screw back is likely .041". Some pushbacks are larger & won't go through.