Deftone and Tony In SC are correct... your find is a tent-rope tensioner/adjuster. At the time it was manufactured, the US Army called it a "tent-slip" and adopted it for service in 1889. These are NOT civil war era, and thus of course are NOT Confederate -- contrary to what some Ebay sellers want you to believe.
Your find was invented and US-patented in by Mr. H.B. Thompson in 1880. Ones manufactured during the first 17 years of the Patent's life were marked with the patent date. Sometimes the Patent can be renewed for few more years... as you see in the photo below which is marked with two dates (the Original-issue date and the Renewal date). After the Patent expired, the item is no longer marked. See the images below.
Some diggers are going to say, "I dug one in a Confederate campsite so I know it's from the civil war and it's Confederate." But exhaustive research examining civil war photos which show tent-ropes do NOT show any of these metal rope-adjusters. Check the tent-ropes adjusters (which are larger and made of wood, not metal) in the Lincoln photo below.