Honestly, It's a set like you would find at Walmart, Kmart, or Dollar General for someone who uses them occassionally or has a toolbox around the house for repairs. They were made in China...hope that helps:)
The yellow tool actually is what everything attaches too. Long piece at the very bottom is an extension for the sockets (not sure which you were asking about). Thanks for checking out my auction!
Not sure how, but yes there is surface rust on most of the tips that are in the little yellow holders. I apologise for not putting that in the description, I honestly hadn't looked at it except to pop it open & snap a picture. Thank you for asking!