DIN 18mm screw neck finish is the most widely used standard of glass dropper bottle and designed to control the distributing dose of medicines and essential oil products, often referred to as GL18, JY18. Its typical dimension is with inner diameter 10.65mm, outer screw diameter 17.75mm and skirt diameter 20mm. Our dropper caps is designed to match this kind of dropper

A variety of shapes and styles can be selected, and droppers with different dropping rate can be choiced.