Grabbers 6 ft. Standard Scaffold frames are manufactured with high-strength structural steel tubing. Its narrow design allows this unit to fit through standard door openings, making it portable to move from room to room. This scaffold unit meets or exceeds OSHA and ANSI Code A10.8 standards. The 5 in. swivel casters include a lock to prevent both rolling and swiveling when in use. A snap pin is included to fasten the caster to the unit.