Connecting links are most commonly used for connecting two ends of the chain together. They are also commonly known as master links. These connecting links are constructed entirely of 304-grade stainless steel. Doing this has created a connecting link that can withstand high and low tempters and operate in harsh climates. These connecting links are part of the General Duty Plus Series of chains, which basically means that they are more durable, and will last longer than an Economy Plus Series connecting link.