2nd Hard Drive Caddy for HP Upgrade Bay - SATA (compare AK868AA)
[HP-2BAY-8730]

Very good and useful product.
Pros:
It fits perfectly to my HP Compaq Elitebook 8730w.
Easy to install, includes all the things you need in the package.
Quick delivery.(5 days incl. weekend to Greece)
Cons:
Little exprensive for it's quality.