The other day I stumbled upon an episode of 'Tougher than nails', some kind of 'Survivor'-type show for craftsmen. One of tasks to complete involved using metal

The other day I stumbled upon an episode of 'Tougher than nails', some kind of 'Survivor'-type show for craftsmen. One of tasks to complete involved using metal templates to properly shape the diameter of a round wooden rod. Well, this required a lot of hammering... So just as a guess, could that be used to smoothen some rods, like arrows or spires? It would be rather a manual tool, like a sanding block. Another guess, is some kind of junction holder. Like a wheel/spokes hub or some sliding rope knot in harnesses, or tent-pitching aid. Made of bronze there must be some reason for durability, hardness, water contact?