The ideal lower tension can now be achieved as a result of improvements in the thread take-up, rotary hook and feed mechanisms. Productivity can now be increased through boosting of the maximum sewing speed to 5,500 rpm. A feed dog angle adjustment mechanism reduces puckering and uneven material feeding. Price USD 112.5 / set Price Condition FOB Ningbo or Shanghai Origin China Material Metal Size 0.653 x 0.242 x 0.45 Meters Weight 33 / 28 Kilograms Delivery lead time 20 days Minimum order 10 sets