Screw Jack/Jack Base Scaffold Components - Screw Jack/Jack Base Screw Jack/Jack Base Photos Product Name : Screw Jack/Jack Base Q'ty : Inquiry Specification Solid : JB-03, JB-03UTube : TJB-03, TJB-03U φ1-1/4” x 24” φ1-3/8” x 24” φ38.5 x 600mm T: 4.0mm φ1.9” x 36” T: 5.0mm Different sizes can be done as request.