Screw backs also available in all kind of materials and sizes, are a little more secure than push backs and other butterflies. Similar to a nut and bolt, the back is screwed into the post. Well, if I don’t fumble it to the floor. I always ask my husband to help me put them on and take they off!!!
Commonly used for diamond studs or children’s earring they are less likely to fall out. However the screwing mechanism wears out over time and you will be ending loosing your earrings.