Do the drawers lock when I'm moving the cabinet around?

Locking mechanism details are not specified in the product data. Before you roll it loaded, test one drawer at speed to confirm it stays closed—some cabinets require you to secure drawers manually or they'll slide during transport.

What size tools fit in these drawers?

Drawer depth and width are not confirmed. Measure your largest wrench set or socket organizer before ordering to make sure it fits horizontally in the drawer you plan to use.

Can I use this cabinet outside or in a damp garage?

Plastic construction handles moisture better than bare metal, but prolonged exposure to humidity will degrade the casters and joints over time. Keep it indoors or under cover if possible, and wipe down the base periodically if it's in a wet climate.