Heavy duty scaffolding is made with rugged 1-1/2" square tubular steel for strength and rigidity. Scaffold height can be adjusted by a single user easily and without tools at 4" increments. Scaffolds move easily and lock into position using four 5" swivel casters with brakes. Scaffold rungs spaced on 12" centers. 12-1/2'H and 18-1/2'H Scaffolding include guardrails, toeboard and outriggers with 4 additional locking casters for added safety and stability. Optional Guardrail Kit is available for 6-1/2'H scaffolding. Kit includes 40H handrail and 6H perimeter toeboard.