H. H. Schleber & Co of Rochester, New York was a manufacturer of thread-wound shot concentrators that would allow hunters to shoot ducks, geese, turkeys, foxes and other animals that were difficult to get close to, from further away.

There were many shot concentrator patents around the world and they all aimed to keep the loose shot, fired from a shotgun, together longer before it started spreading out. Modern guns and even some guns during this time period, use a method called choke-boring that tapers down the muzzle-end of the barrel to achieve similar results.

Schleber’s patented, thread-wound shot cartridges were designed to hold lead shot inside two tin half cylinders that were held together by thread that would unwind in flight after it was fired. After the thread completely unwound it would release the shot. They were wrapped with varying length of thread that corresponded to how many yards away the target was that you wanted to shoot. Some early reviews of the system noted that the hunter would need to be good at judging the distance needed in order to correctly choose the right cartridge; especially since at closer distances it would be a large solid projectile until it fully unwound.