We use this hammer head to form tight borders of note membranes on Saraz Handpans. This is the physically highest skilled job in the entire building process. Steadiness is key. Too many strikes in one place will cut the steel, not enough leaves a gap in the tension border. We created this head over time. It is very important to know exactly where one wants a border this tight. Otherwise, it is much more difficult to tune the note. The steel doesn't forget these strikes.