Brand New replacement Platinum stamped. 950 (95% pure) Heavy Screw Backs. 1/4 - 5.75mm Pad size. 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. And some use even larger.
20 Gauge will just barely fit through a. If it doesn't fit, yours are likely. 22 Gauge will fit through. 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.
If you have some regular push backs, they are typically only. If they are able to go thru your screwback, your screw back is likely. Some pushbacks are larger & won't. The item "PAIR 5.75mm SOLID 950 PLATINUM 0.041 Post Threaded Screw Earring Backs Nut USA" is in sale since Saturday, August 3, 2013. This item is in the category "Jewelry & Watches\Jewelry Design & Repair\Jewelry Settings\Earring".
The seller is "jewelrymaven-net" and is located in San Tan Valley, Arizona. This item can be shipped worldwide.