These wheels are for the FMS K5 Blazer. They allow you to use the factory bead lock system, tires, and screws. These have only been test print on a SLA printer. They decrease the wheel offset as much as possible without hitting the portals or the tires hitting the body. Do not cure these for more than 1.5min as the screw bosses can crack when installing the screw. Slowly install and back out the screws little by little so that the screws will slowly cut the threads. Minor cracking to the screw bosses will not affect the tire mounting integrity.