bracketNL
LOAD CAPACITY: 65-390 daNWHEEL TREAD: antistatic rubber tread; hardness 83 Shore A. CENTRE: made of two riveted galvanizec pressed steel discsBRACKETS:  NL, 
Suitable for humid environments and outdoors; not suitable for applications where organic solvents, chlorinated substances, hydrocarbons and mineral oils.
Suitable for all types of floors, even outdoors.They easily overcome obstacles, do not damage fragile floors, but they may mark the floor.