A set 4 New 1 3/8" Scaffolding 24" Adjustable Leveling Galvanized Screw Jack with Base Plate Four Brand New 24" x 1 3/8" Galvanized Screw Jack with Base Plate 18" adjustable Thread, will fit on 1.69" and 1.625" OD Scaffolding The Screw Jack is made from a 1 3/8 inch Hollow Stem with 6" x 6" base & a large wing nut for adjustment. Weight 8 Lbs for each Jack. We are scaffolding equipment distributor and carrying large inventory of scaffold frames and accessories for timely delivery.