Square head 16 - protrusion 12 mm - use tapered punch BOUT1.
For competition, soft and slippery ground. Shoe thickness 8 or 10 mm. Square hollow head 16 mm wrench, protrusion : 12 mm out of the shoe. Tapered shank with big diameter 9.5mm. Drill Ø 8.5 mm and use tapered punch ref. BOUT1. Weight 21 g.