Originally I got a cheapo Matco roller years ago from Home Depot and it worked well enough for the few tools I had, but the bottom open space is useless, even with the drop down door. When I started getting more tools, I found a pair of used Craftsman rollers and top cases. I probably spent about $100 for each unit. They have drawers from top to bottom and are working fine for my needs. One is for just tools and the other is for spare Jaguar parts, hardware and trim. They are not roller bearing drawers but if well lubricated don't give me any problems. They won't support the weight of a car falling on them but they don't flex under the weight of my tools, roll around easily and I have the drawers marked with what is in them with magnetic stickers. I hate having to look for tools I know I have and these keep things manageable. I wish the rest of the shop was as organized as my tool drawers.