From Black Diamond:

The Access Spike is our workhorse traction device, built for all-around trail performance, whether you're on a winter training run in the mountains, or out for a summer alpine scramble in varied technical terrain. Drawing from our extensive experience designing climbing crampons, the Distance Spike features 14 spikes which have an optimized 8mm length, designed to provide excellent engagement on snow and ice, with improved stability on rock and hard surfaces. The spikes are made of stainless steel and are heat treated for superior strength, corrosion and wear resistance. The Access features a full elastomer harness for ultimate footwear adaptability and includes a heel webbing loop for easy on/off and heel identification.