Unfortunately, those are plain steel pins, not carbide.
“Gage Pins are used to measure the size of a bored hole. They come in a variety of sizes and classes. We provide class ZZ Gage Pins that are sized .0005″ apart and are accurate to .0002″. The pins we source are made from a Carbon Chrome Alloy Steel (grade 52100 bearing quality steel) and heat treated to a 60-62 Rockwell C hardness. We choose this class as a good balance between availability, and size selection. Despite the hardness and polish, some form of lube will be required; graphite or a lanolin based wax manufactured for use with reloading supplies is recommended. Petroleum based products will kill powder and primers.”
