Cart Wheels 4 inch 4 inch casters set of 4, 1/2"-13 standard course thread and 1-1/2 inches shaft length for quick and secure installation. 700 LB Load Capacity 4 inches diameter thermoplastic rubber stem caster, 175lbs load capacity per caster wheel and 700lbs of four castors total. Quiet & No Marks Soft rubber treads with ball bearing swivel for super smooth and non-marking mobility. These screw in casters suitable for various floor, they've held up in a laboratory environment as well with exposure to solvents and oils without failure or degradation. Wide Applications Perfect replacement wheels for dolly cart, wire shelving rack, work table, grill cart, chair, craftsman stool, hand truck, metal frame, cabinet etc. Thick Hard Grippy These new wheels have a nice thick hard grippy rubber wheel that stays put even on fairly smooth laminate flooring.