Coupling Links or Connecting Link, The Name of Coupling Links very popular in European Market, Others name is Connector or Chain Connector, Half Coupling, Omega Links, Clevis Coupling, and Hammerlok.

The Connecting Coupling usually use for connecting the chain and the master link or connect the chain and eye Type Hooks, The below is How to connect the chain link and master link:

Others Related fittings: Lifting Sling Hook with Heavy Latch Eye and Clevis Type, Lifitng Grab Hook with Wings,Chain Shortening, Master Links and Sub Assembly. Grade 80 Lifting Chain 10*30, 8*24MM, Lifting Safety Hook With Safety Self Locking Latch, Lifting Master Link and Sub Assembly, Oblong Type