Scaffoldings, these days, you know how fickle they can be. One minute you're rolling them down the floor of your basement or garage and the next minute, the wheels come off. That's when this set of four Caster Roller Wheels pull up to get your gear back in gear. Sure, they can screw right into any Honey Can Do shelving unit, but their universal design makes them ideal industrial wheels for furniture around your house or other rebellious scaffoldings. And because you like to be thorough, make sure to check the diameter of those holes prior to purchasing. Details:Black4" x 4" x 4"4 casters