Package Content: You will receive 8pcs #415 chain master links, packed in a case for easy storage. Enough quantity for you daily needs in replacing chain accessories.. Product Size: Each #415 chain master link measures about 14.5x22.9x10.3 mm / 0.57x0.9x0.41 inch. Please check the size of our product carefully before purchasing!. Premium Material: Our roller chain connector links are made of high-quality steel alloy. With secure nut, the chain master links are sturdy enough and durable, which can prevent ""heat cracking"" caused by supercooling and undercooling.. Easy to Use: Unique forged design makes it easier to install and disassemble.. Wide Application: Widely applied in racing competition, such as bike, mini bike, bicycle, karting, pit ATV and so on. These bike chain master links are required regular cleaning and lubrication.