Depends what kind of 5.25" floppies you want to read. Apple made an external 5.25" drive for IBM 360KB diskettes, but it won't read 140KB Apple II or CBM diskettes. For those you're pretty much out of luck.
Important note (stop me if you've heard this one): you should never attach an Apple II 5.25" drive to a Macintosh (unless it has a IIe emulation card installed) as it will result in either the disk drive or the Mac getting cooked (or maybe both).
Important note (stop me if you've heard this one): you should never attach an Apple II 5.25" drive to a Macintosh (unless it has a IIe emulation card installed) as it will result in either the disk drive or the Mac getting cooked (or maybe both).