The Juki LU-1508N is the first heavy-duty machine in our line with a drop-in full-rotary hook system. These hook systems are more reliable than the traditional side loading hook systems, and can often sew with heavier weights of thread. In addition, the 1508N has more torque and a larger bobbin than any of its predecessors. The biggest difference that separates the 1508 from the others is its bottom feed system. The feeds dogs on the bottom move in a perfect rectangular box direction. This means the material with feed straighter and the chance of having different size stitches is almost all but eliminated. If you want the best looking top-stitch for heavy materials the 1508N will be the perfect machine for you.