Simple & Easy to adding storage space, Add up to 1TB of extra space.
Completely hidden and fits snugly into your Surface Book 2 15" SD card slot.
For Surface Book & Surface Book 2 13.5", please choose model 350A ; For Surface Book 2 15", please choose model-351A.
Product dimensions : 25 mm (Width) x 20.6 mm (Length/depth) x 2.1 mm
Toolless : When you remove without any tools / Use aluminum material and each one is CNC precision machining.