Before you buy adapter for your macbook SSD, you must know which type of your SSD it is,then you can buy suitable Sintech adapter for your SSD.There are 4 types of macbook SSD: 2010-2011 Air, 2012 Air,2012 Pro,2013 Air and Pro.Here we have 2 ways to distinguish Macbook SSD type:

1. According to the gold pins :

a: 2010 and 2011 version MacBook Air SSD is 6+12 pin, only one side have contact, size is 109 mm*24 mm. It's SATA interface.
b: 2012 version MacBook Air SSD is 7+17 pin, size is 109 mm*24 mm； 2012 version MacBook Pro SSD is 7+17 pin, size is 89 mm*33 mm. It's SATA interface.
c: 2013 and 2014 and 2015 version MacBook Air SSD is both side have contact, one side is 16+12 pin, the other side is 11+14 pin, size is 89 mm*24 mm. It's PCIe X4 interface.

2. According to SSD Part No and Macbook Model NO which the SSD is from: