Metal (brass) eyelet for edging vents in German side-caps, field caps. Enamel painted in the correct color. The kit includes a washer for fastening from the inside. A manual press is used for installation, however, it is easy to fasten the eyelet manually (because it is quite soft) with a blunt round object as a rig.
The inner diameter of 3 mm, the outer 7-8 mm.
Price for one piece. You need 2 pcs. for a side-cap, 4 pcs. for a field cap (depending on model.