Specifications Model No.2.48-7.87"(63-200MM) four rings manual MaterialsAluminum alloy casting, 45# steel Welding level(F, mm) Outer dia 63mm(2.48")?75mm(2.48")?90 mm (3.54")?110 mm (4.33")?125 mm (4.92")?140 mm (5.51")?160 mm (6.30")?180 mm (7.09")?200mm(7.87") Docking deviation=0.3mm Power of Heater2.5KW/110V Power of Milling Cutter1.1KW/110V Working temperature300°c Temperature deviation±5°c Environment temperature-5……40°c Time required to reach soldering temperature