Can make SWG with or without inner & outer ring, need not complex molds. Work pressure is changed with dia. Size controlled by air pump. Need additional welder. 1. Power: 380AV, 50HZ, 1.5 KW; 2. L*W*H: 0.6*0.8*1.6m; 3. N.W.: appr.450kgs 4. Line Speed: Transducer control 5. Work range: ID 300~1200mm Thick. 4.5mm, 3.2mm Other thick. 7.5mm on request