Grip Studs® are small-sized spikes that are not screwed into prefabricated threads. Instead, they are directly drilled into the plastic material of the Duplo horseshoe with a specific adapter. Spikes are very versatile and are regarded as preliminary stage to bigger studs.
The self tapping spikes are drilled directly into the shoe. Ideal setting is with the top spike thread flush to the shoe surface. Do not countersink the spike in too far.