Scaffold jack base, u-head, screw jack base, hollow jack base, solid jack base 1. Surface treatment: painted, galvanized 2. Available size: 400mm, 600mm, 700mm, 800mm, or customized size 3. Diameter: 30mm, 32mm, 34mm, 38mm, or customized size 4. Base plate: 120*120*4mm, 140*140*4mm