The J3-20 is the next model up from the J3-18, with additional stitches and feet and includes the built in needle threader.
 
Stitches - total 20, including blind hem, stretch, overcasting for neatening raw edges, 4 decorative and an automatic one step buttonhole. (Put the button in the back of foot and machine will sew the right size in one go).
 
Stitches are easily selected with the selector dial and can be adjusted in length. The width can only be adjusted on zig zag. Stretch stitches are preset in length and width. Maximum stitch width 5 mm, maximum stitch length 4 mm.
 
Front loading bobbin - traditional bobbin system, bobbin fixes into the front of the machine. Bobbin case pulls out and the placed in and