Need to add or replace drives in your small-form-factor (SFF) Dell Optiplex? This lot of 10 used caddies is perfect for IT departments, repair shops, or hobbyists. They're pulled from Dell Optiplex 740, 745, and 755 SFF models and include the matching cooling fan for each caddy. They're used, so they might have some scuffs or scratches, but they're fully functional – they hold the drive securely and the fan spins. The interface is SATA I. This is a super cost-effective way to get a bunch of caddies for upgrading multiple machines or having spares on hand. If you're refurbishing Optiplexes, these are essential. Beats trying to 3D print them or rig something up. Just slide your 2.5\ or 3.5\ drive in, screw it down, and pop it into the Optiplex bay. The included fan helps with airflow in those tight cases. A great bulk buy for anyone working with these common business desktops. Get your lot and get those upgrades done!