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We require Heavy duty Screw jackTon -28 tonThread -Trapezoidal (SQ)Top Dia and thickness -170mm x 12 thickbottom dia and thickness - 170mm x 12mm thickMax height - 460 mmMin height - 350 mmSpindle dia - 62 mmTop and bottom flange support plate - 20 mm The required quantity is 28tons. screw jack,heavy duty screw jack,lifting jacks,trapezoidal jack Screw Jack for scaffolding