I have a single speed bicycle which has a spacer screw that controls the position of the rear wheel and hence the tension of the chain.
The screw goes through a small hole in the frame, which is threaded, and in to the drop out area. With the pair of screws at a level pegging, the proper position the wheel is assured and the chain tension is maintained.
What is the name of this part? I've bent one of my screws and need a replacement but can't find a hit on "rear wheel spacer screw."