Features: Metaltech "Contractor Series" Adjustable Height Leveling Jack with Base Plate Galvanized hollow core design - 24" Can be adjusted over 18" rangeUsed with standard or Walk Thru arched framesMeets OSHA RequirementsA scaffolding can support heavy loads but requires a solid foundationWhen the scaffolding is assembled on concrete floor, wheels or base plates are recommendedIf the scaffolding is assembled along an external wall, adjustable leveling jacks nailed on beams are...