... or thinner needles used for lighter materials. Higher size numbers indicate a needle of thicker diameter, used for heavier ... sewing. DBX1 Needles are also sold under these needle style numbers :16X231, 16X257, 16X95, 1738, 1738A, 287WH, 71X1, DBX1, DBX257 ... , SY2254, SY2270Sewing machine manufacturers use different needle style numbers for the same exact needles.Groz-Beckert® DBX1 needles are ...