2014 Edition. Updated information includes the new SCHMETZ Color Code Chart. How much do you really know about your sewing machine needle? A little 2" piece of steel, the SCHMETZ needle, is the most important part of your sewing machine.The sewing machine needle is also probably the least understood and, certainly, one of the least expensive replacement parts. The SCHMETZ ABC Pocket Guide is a 36 page booklet of household sewing machine needles that no sewing enthusiast should be without. Perfect for both beginners and experts. The Guide includes complete descriptions (i.e., features, suggested fabric use, needle anatomy, etc.) of the different SCHMETZ specialty needles available. 3-1/8" x 4-3/4" size is perfect for pocket or purse.