Square head 12 - protrusion 9 mm - use tapered punch BOUT1.
For soft ground, snow and ice. Shoe thickness 10 mm. Square head 12 mm wrench, protrusion : 9 mm out of the shoe. Tapered shank with big diameter 9.5 mm, drill Ø 8.5mm and use tapered punch ref. BOUT1. Weight 13 g.