The 1/8 inch square drive is here because it is pretty cool. This set appeared and then disapeared. I can guess why – it is too small.
The 1/8 inch square drive had appeared by 1970 in consisted of only 5 parts. This is a very small set (in numbers and size) this will easily fit in the palm on your hand. There is a small box and one option in 1970, a bit holder.