... a special design, it essures machine runs quietly under high speed and long time.2.The machine is produce precisely, highly ... -compatible with spare parts, easy adjust and repair.3.Auto oil circulation system, auto oil feeding ... for the machine.5.With "double hook single needle" and "double hook double needle" devices. It can be ... H.P 2 H.P 2 H.P Rotation Speed 1,300-1,500 rpm 1,300-1, ...