Each set comes with *7 galvanized steel spikes for maximum grip and minimum wear.
Drill a hole into the pre-drilled points provided for this purpose, choosing a max diameter of 4.2mm and a max depth. 9mm.
Screw the spikes (you may want to use a wrench). Ensure a snug fit but don’t overwind the spike. For extra reinforcement, add some glue to the spike before screwing.
Caution: Be careful not to over-tighten the spikes. When applying spikes, make sure to only use a fairly new boot. It is important that the sole is still intact (little abrasion) as the spikes otherwise might push through the sole.
*1 spare spike included in case of loss.