The WINTOOLS specialty rolling knee dolly has foam-cushioned knee cups and six swivel caster wheels and can be used by mechanics, maintenance personnel, or other people who work on their knees for extended periods. The dolly is made of polyethylene, which weighs less than steel or cast iron, won’t splinter as wood can, may be wiped clean, and is resistant to dents and corrosion. Foam-cushioned cups help support the user’s knees. The caster wheels swivel for maneuverability, measure 2 inches in diameter, and are made of polyolefin, which is resistant to water, impacts, and abrasions and won’t mark floors. A built-in tool tray helps keep tools within reach. This dolly has a load capacity of 350 lb., weighs 5 lb., and measures 3-3/4 x 20-1/4 x 10 inches (H x W x D). (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) This product is intended for use in professional and industrial environments.