... a special design, it essures machine runs quietly under high speed and long time.2.The machine is produce precisely, ... fast adjusted for the machine. 5.With "double hook single needle" and "double hook double needle" devices. It ... H.P 2 H.P 2 H.P Rotation Speed 1,300-1,500 rpm 1,300-1, ... Normal equipment DR: Double-roller device DH: Double hook single needle DW: Double hook double needle DP: Double picot ...