... , In Pairs or Multi-Units Arrangement Available Power SourceElectric Driven, Manual Operated or Both Are Available AccessoriesProtective Tube, Rubber Bellows, Electric ... , Bevel Gearbox, Swivel Plate and Trunnion Base etc.Bevel Gear Jacks Materials: Lifting Screwsteel C45 (optional: stainless steel)Worm Gearphosphor bronze (optional ...