Pack of 30 SCHMETZ Industrial Walking Fooit Sewing Machine needles. Needle System* : 135X17, DPX17 Also sold under these system numbers : 135X17, 2167, DPX17, SY3355, 335-0311 *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. Schmetz 135X17 needles are available in following sizes. Please select your size : Singer Size 14 (Metric Size 90) Light to medium-light work Singer Size 16 (Metric Size 100) Medium weight fabrics Singer Size 18 (Metric Size 110) Medium to medium-heavy fabrics Singer Size 19 (Metric Size 120) Medium-heavy to heavy fabrics Singer Size 20 (Metric Size 125) Heavy fabrics Singer Size 21 (Metric Size 130) Heavy fabrics Singer Size 22 (Metric Size 140) Heavy fabrics Singer Size 23 (Metric Size 160) Extra-heavy fabrics Singer Size 24 (Metric Size 180) Extra-heavy fabrics These high quality needles will fit many models of industrial & domestic walking foot machines, bartack machines, single needle machines, twin needle machines including : Artisan : 29, 611, 618, 797, 2618, 2698, 4400, 4420, 6191 Brother : B220, B430, B431, B432, B797, B798, B837, B838 Chandler : DY-337 Consew : 28, 118R, 119R, 166R, 166RB, 205RB, 206RB, 223, 224, 225, 226R-1, 227, 229, 239, 244, 254, 255, 277, 282, 288, 289, 339, 358, 382, 389 Durkopp : 147-1, 147-2 Feiyue : FY5318