SSD to NGFF M.2 PCI-e Converter Adapter 12+16Pins 2013-2017 For MacBook Air Pro
Because adapter card + SSD, size is bigger than standard M.2 NGFF solid-state drives. 2012 version MacBook Air SSD is 7+17 pin, size is 109 mm x 24 mm. 2012 version MacBook Pro SSD is 7+17 pin, size is 89 mm x 33 mm.