StarTech.com Heavy Duty Casters for Server Racks/Cabinets, Set of 4 Universal M6 2-inch Swivel Caster Kit, 45x75mm Pattern, Replacement Caster Wheels for 4 Post Racks, Steel/Plastic - 4-Pack Rolling Caster Kit (RKCASTER2)

45mm x 75mm bolt pattern. This caster kit can be used on any rack with a 45mm x 75mm bolt pattern to replace damaged casters and upgrade a floor rack to a rolling rack for additional mobility. 2-inch caster wheels. Four-pack of universal swivel casters can be used as replacements on portable/mobile 4-post racks such as RK1833BKM, RK2433BKM, RK4242BK24 or to convert a floor rack to a rolling rack when casters are not included. Heavy-duty load capacity. Tested to 1.6 times their rated load capacity to ensure performance, these heavy-duty casters/wheels, can individually support up to a stationary load of 550 lbs. (250 kg) or a rolling load of 165 lbs. (75 kg).