Toggle punch is used to pierce the dewlap about 1" back from the fold. Dewlap tags can be attached through a hole punched in the dewlap approximately 8" to 10" below the jaw. They can be installed on a week-old calf or a grown animal. The hasp is then run through the holes, the tag slipped onto the hasp, and the hasp ends bent at a right angle with the tag.
