Pack of 10 Groz-Beckert Curved Blindstitch Machine Needles For Industrial & Portable Blindstitch Sewing Machines. Needle System* : 29BL (Curved Blindstitch Machine Needle) 29BL needles also cross to these needle system numbers : LWX2T, LWX6T, 29-20, 29-34, 29-35, 29-49, 29-BL, 2140TP, SY7395 Sewing Machine Manufacturers use different style numbers for the same exact needles. *A needle system is a group of needles made to fit specific sewing machines. All needles in a system are of the same length and shank size, but are of various diameters. Lower size numbers are narrower or thinner needles used for lighter materials. Higher size numbers indicate a needle of thicker diameter, used for heavier materials. Match your needle system to your machine, then the size of the needle to the product you are sewing. Groz-Beckert 29BL needles are available in following sizes : Singer Size 9 / Metric Size 65 Singer Size 10 / Metric Size 70 Singer Size 11 / Metric Size 75 Singer Size 12 / Metric Size 80 Singer Size 14 / Metric Size 90 Singer Size 16 / Metric Size 100 Singer Size 18 / Metric Size 110 These curved needles will fit many Industrial & Portable BlindStitch Machines including Consew, Econosew, Gemsy, Lewis, Kobe, Reliable, Rex, Treasure, Tacsew, Yamata, Yamato and more. Needle packaging may vary.