The Rigging Bullet with threads provide an easy way to install mounts in out of reach places where before the only previous options would have been self threading screws, well nuts, or pop rivets. The three different threads on our rigging bullets are designed to fit whatever mount you prefer to use. Use Rigging bullet #8-32 threads for our GT90 GearTrac with a FullBack Backing Plate. Sold in a pair.