The surface contact structure that does not damage the part of the hexagon socket head bolt that the tool contacts is a selling point. The hexagonal part of the wrench tip is not a flat surface, but it is gouged like a hex key wrench in extreme terms. A fluffy German. I often realized this structure with stainless steel which is hard to process. I liked the surface finish like an anodized silver like a combination spanner of the Stabilize. It is likely to be a living thing!