#3 STANDARD SIZE CHAINS, 3/32" (2.4 mm) Ball Diameter is the most commonly used ball chain lanyard size. It is the same size that we supply to the US military for their dog tag chains. These dog tag chains are available in a variety of metals from the stainless steel, which we supply to the United States military to light weight aluminum. We are extremely proud that our ball chain necklaces carry our soldiers dog tags here in America and around the world. Additionally, we manufacture our ball chain neck chains in multiple styles, finishes and lengths.