I needed to fit a 3.5" card reader into the 5.25" optical drive bay (DVD/CD-ROM drive bay) in my computer, so I made this adapter/bracket.You can fit the 3.5" device to the adapter with one or two screws on each side, or two screws underneath.To secure the adapter in the bay, use one self-tapping screw on each side. Regular optical drive bay screws will probably also work OK.Update: Version 2. More rigid. Made the screw holes for the 5.25" mounting a little bit narrower.