The K Series casters has all the features of heavy duty type: double ball bearing raceway, Zinc coating, steel bracket thickness is 5.5 mm. So the casters can withstand heavy load, however you should use the hard Nylon wheel on even or soft surface.
A rare Heat resistant caster that have double bearings and convenient aluminium brake. The caster is also designed to last long, easy maneuver and very reliable. Load capacity is 180 kg per caster, so it can bear large and heavy package