these curved needles use for Most of the Industrial Blindstitch Sewing Machine. including, Lewis, Kobe, Treasure, Tacsew, Yamata, Yamato and more. Please e-mail with your machine name and Model number to double check. other system name: LWx2T, 29-20, 29-34, 29-35, 29-49, 29-BL, 2140TP, SY7395