The Rigging Bullet with 1/4"-20 threads provides 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 #1/4"-20 threads for our MightyMount II with FullBack Backing Plate. Sold in a pair.