First, you need to know which grade is the chain in your hand. When choosing the chain components, you need to choose the same grade components. Second, for a 1-leg or 2-leg chain sling, you should choose a master link, connecting link, and chain hook. For 3-leg and 4-leg, you need to choose master link assembly instead. For chain hook, if you do not have a welding machine and professional technician, we won’t suggest you chose an eye hook. Chain hooks with clevis head are ideal for easy assembly. And for different applications, you can either choose slip hook, self-locking safety hook, or grab hook. But very important is all the hooks need to come with a safety latch to prevent load slip out the hook.