Those are 1/8" pins, which would be .125. They're likely the center pins for the LB7 model knives with the nickel silver bolsters, just can't recall the exact knives right now. The brass bolstered/linered knives such as the LB-7 and the UH line had Brass pins. One end was headed so that all they had to do was cut and spin the opposite end. In fact it was probably already cut to length.
These are the compression rivets I was referring to, you see they actually spread the walls of the female end, once they're in they never come out, the majority of Schrade, as well as Canal Street sheath knives were made with these: