Table rim clips are used to secure the glass or acrylic top up into the removable table rim. 
They do not screw on. They are bent to push the top up into the rim. US standard size, not metric.
Choose your size and color.

Measurements: 
.760" wide x 1.575" long;  

Color:White

Material: Nylon
 

10/Pack Table Top Rim Clips Nylon Patio Table Glass Acrylic Tops Furniture Repair 1.23" or 1.575" Length, Сhoose Color and Size