The 20U class has also been designed for natural, synthetic fabrics and for light weight leather
 with perfect straight  stitching with up to 12mm of zig-zag stitches. 
 The Knee lifter can be used to raise the foot or control zig-zag width. 
 Buttonholes are produced by means of right, center, and left needle positions.
 The needle bar frame locking clamp is engaged by a quick 1/4 turn of a knob. 
 With a built in bobbin winder and a hook that automatically advances and
 retards timing (according to zig zag width) the 20U class also incorporates an
 adjustable forward and reverse stitch length mechanism.
 Zig zag plate, straight stitch plate, and embroidery/darning plate included. 
 Zig zag/satin stitch and straight stitch feed dog included.