Adapter to hold 2"5 or 3"5 HDD drives into a 5"25 CD Rack Dimensions and screw positioning are based on Standard specifications. The source file is an Openscad file avalaible on github: https://github.com/GillesBouissac/agentscad/blob/master/things/2.5-3.5-to-525-drive-adapter.scad In order to execute it you need these prerequisites: https://github.com/GillesBouissac/agentscad/wiki/Prerequisites