this is the 512gb ssd for macbook pro, i ordered it for my old macbook pro retina early 2015 which ran with a small 128gb ssd, it’s always out of disk spacethis is a 512gb ssd which is 4 times capacity of the old one, should good enough for a few more yearsit’s much more easier to install than i thought, 2 necessary screwdrivers are included, i wish they include a pry tool as it’s needed to disconnect the battery; there is a link to tutorial in the leaflet included, i spent just about 15 minutes for the hardware installationthis ssd has os catalina pre-installed, so it’s plug and play, saved me much time for preparing thumb drive installation, i upgraded to os monterey after initial setup my user information, absolutely no problem to upgrade to the latest oslastly, it’s very fast in read/write speed, 2 times the original mac ssd speed (old: 632mbps vs new: 1217mbpsall in all, i’m very satisfied with this product, would recommendhope you find these information helpful