1/4"

3/8"

1/2"

2 Sizes for each for larger and smaller sockets, can add as many or as few as you like in a line, they slot together loosely. They are compatible across the sizes so you can continue the line with any size socket.

Made for my cousin in a rush so they are pretty basic, no fancy edges but they get the job done and are pretty solid, worked a treat to line his toolbox.