CBM Scaffold Brand New 4 Brand New Solid 24"X 1-3/8" Solid Galvanized Screw Jack with Socket. This 24" Solid Socket Jack with 18" Adjustable Thread will help you set your scaffold level. 24" x 1 3/8" Galvanized with 18" adjustable Thread, will fit on 1.69" and 1.625" OD Scaffolding. This Screw Jack with Socket and 18'' stem is adjustable in height....................... IF YOU HAVE ANY QUESTIONS PLEASE CLICK ON (CBM SCAFFOLD)