Those look like bolts for attaching the cutting edge on toe mold board of a plow or grader blades.
As to the wearing of gloves near things that spin, most of us are of the opinion that gloves are taboo, but there are times when having gloves on is safer than being without them my fingers are so calloused that I can not use fingerprint activation devices. I can imagine what this person's finger tips would look like after doing this day in and day out for a period of time without gloves