DIYers and workshop folks, these POWERTEC caster wheels are seriously heavy-duty and perfect for mobilizing your projects! The 3-inch diameter polyurethane wheels roll smoothly over most surfaces without marking up floors, and that bright red color makes them easy to spot in a busy workshop. Each caster can handle up to 160 pounds, so the set of four gives you a massive 640-pound total capacity - plenty for workbenches, tool carts, or heavy storage cabinets. The fixed plate design means they don't swivel, which actually provides more stability for heavier loads that need to move in straight lines. The steel sleeve bearings inside ensure smooth rolling even under load, and I've noticed they don't develop that wobble that cheaper casters get over time. Installation is simple - just bolt through the pre-drilled holes in the 2-3/8 x 4 inch plate. The polyurethane won't flatten out over time like rubber wheels often do, which is great for equipment that sits in one position for a while. I've used these on my welding cart and assembly table for months now, and they're still rolling like new despite daily use over concrete floors. If you're tired of wimpy casters that break under load or mark up your floors, these POWERTEC wheels deliver that professional-grade durability and performance that makes moving heavy equipment around your shop so much easier and safer!