How do screw back earrings work? The screw back twists on and off a threaded post, just like a screw that twists on and tightens. The screw back piece is covered/closed on one end which encases the sharp post. This type of secure, safe earrings are comfortable to wear day and night. We sell extra screw back pieces too (screw back nuts) in case you want extras to keep just in case. We have loads of screwback styles to choose from to fit baby ears or older girls. Try out any of our children's screw back earrings, in 14k or 18k gold or silver, and you'll be happy you did! No more lost earrings!