We're working out what we think - we'll add our view here!
Gossamer Gear says:
A package of 8 individual buckles
Keep the corners of a ultralight shelter taunt with these guyline locks. Great if you are building your own shelter or wanting to modify your current then. These locks are what you are looking for.
For anyone who has ever lost a line lock or is seeking some for their own needs, we have what you're looking for. Fact is, we get a fair number of requests for separate bits and pieces and decided to make everyone's life a bit easier.