Specifications: Straight stitches sew up to 2500 stitches per minute Zig-zag stitches sew up to 2000 stitches per minute Built-in bobbin winder Left, Center, Right Needle Positions Needle bar frame locking clamp engaged by a quick 1/4 turn of a knob Automatic Hook advances and retards timing according to zig-zag width Independently adjustable forward and reverse stitch lengths Buttonholes produced by means of right, center, and left needle positions Knee lifter to raise foot or control zig-zag width Uses size 9 to 19 needles (Organ 135x7, 135x9 or Singer 1910 needles) Single needle lockstitch with reverse lever All-metal industrial rotary hook   Uses Standard Needle; DPx7 (135X7) (135x9) Singer style 1910 Or Spear Point Needle; 135x16

The 20U class has also been designed for natural, synthetic fabrics and for light weight leather with perfect straight stitching.

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.
 
Also Included: Straight-stitch foot | Zig-zag foot |  Zipper foot |  Manual buttonhole foot |  Instruction Booklet

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