Our half link chain is the most reliable in the industry, The perfect chain for maximum Adjustability And great looks. half-link chains are perfect if you're looking to run a single speed setup on a bike with vertical dropouts. Their Adjustability makes them Ideal for getting your wheels into the perfect position. Half-link chains give you the ultimate level of Adjustability, allowing you to cut down the length of the chain by half a link each time, which means You can get the perfect link without having to compromise. 1/2" X 1/8" - 100 links, pin length 9, 5mm compatible with: BMX/ freestyle super smooth & adjustable half link design nickel plated.