Heavy duty top and bottom feed backstitch sewing m

1. this machine has 250mm long arm 2. Equipped with anextra large horizontal rotating hookand bobbin for use with thickthreads 3. Top and bottom feed mechanismwith reversestitch ensures perfect and fine lockstitches on suchthick materials from 3mm to 12mm in thickness without any slippageof the upper and lower pieces of material . 4. Specially for extra heavy duty, such as thick leather tarpwulins, horse ruges, harnesses ,vehicle upholstery, shade sails, water-proof cloth cloth,travel bags, suit cases, thick cloth and other bulky material.