Replacement Klickfix Topklip Clip, specifically for the version used on Tern Market Basket that allows it to clip to the bike rack.
The original part is rated up to 10kg, after being overloaded, it broke in half. This model was created using a scan of the original parts and works as well as the original, though I haven't stressed it to breaking to determine if it performs as well as or even better than the original, so please evaluate the print quality and test that it meets your needs before relying on the part.
The author marked this model as their own original creation.