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 advised. 9.40 L. 24.00 W. 5.50 H.