These gluing end caps are a great way to finish a cord design. The opening varies from about 1.9mm to 2.1mm, and you must glue the cord to the hook end. Hole is about 2.5mm deep. Please note that this finding is not designed to be a crimp. The overall size is 15mm long and the base is about 4mm at the widest point at the base. Sold individually (but most projects require 2 hooks, or one hook and some kind of loop on the other side).