Use :
To mount an mSATA card in place of the 17+7 pin SSD present on the 2012 MacBook Pro Retina
Specifications:
For mSATA drives
The adapter will allow you to mount the mSATA SSD (Half Slim or normal size) in place of the original SSD on a 2012 MAC Pro or Retina:
A1425 A1398 MC975 MC976 ME662 ME664 ME665
Plug and play