The Prym tripod is a practical tool for applying snaps and eyelets on places further from the edge of the fabric. It's three legs allow it to stand firmly and therefore you can apply rivets, eyelets, snaps and jeansbuttons at any point in your garment
The disk will be under the material and the tripod will fit at the top
Insert the punches (in the package of eyelets, snaps etc.) in the disk and the tripod according to the manual on the pack.
The snap will be fastened with a hammer (preferably a plastic hammer)

Because of its ergonomic  design this helpfull tool was even awarded the Red Dot Desig Award

You can use the tripod with all prym snaps, eyelets, rivets and jeans buttons except the color snaps and the 11 and 14mm eyelets