Adjustable Jack is using for adjust the distance above the ground 1.Material:Q235 tube; 2.Diameter:42*2.3mm; 3.CE certificate Adjustable JackMaterial:Q235 tube;Diameter:48*3.5 mm,42*2.5 mm;Certificate:CE,ISO9001:2008; Base Jack, or adjustable jacks or scaffolding jacks, as they are known in the scaffolding industry. They are used to give support to the total frame of the scaffolding and insure ...