This was in a bunch of reloading stuff given to me to get rid of. The circular steel part is 1.25 in, its spring loaded, the inside part has 6 sides with a little point/cutter at the corners. The only id is Forster Products Lanark,ILL. Cuts a perfectly round 1.25 in hole in a cci primer cardboard sleeve. Looks kindaAttachment 235257Attachment 235258Attachment 235259 small for a patch cutter? Needs some cleaning.