This one is 4 1/8 closed. CPM-154 blade hollow ground and satin finished with a pivot bushing. Integral 416 liners/bolsters mill relived at the pivot and lock release area. Red Richmond jigged bone from Culpepper.
KCorn, I make my spinners from drill rod. Use a 1/8 ball endmill or a 1/8 drill bit in a lathe to make a dimple in the end of the drill rod. I taper the end also. I use a hand drill and taper it on my belt grinder. Then heat treat the spinners. The smaller pins are polished before I install them.
I use a 3 mm polishing pin from Rio Grande to polish them. Use a small burr to make a dimple in the end of the craytex before polishing the pins. If not you can't keep it on the pin and it will flatten the pin out.
Here is the link to them from Rio Grande. If you order some get the extra mandrels also. I like the brown, grey and red.