Diameter 21mm, height 9mm, inner diameter 6mm without slot.
 Suitable for many household machines such as Singer / Veritas / Neuman, Anker, Textima, Ideal, Riccar etc.
 and Asian high-speed industrial sewers such as Juki DDL, Juki DLN, Brother, Global, Pfaff 1163
 Pfaff 9063, Mitsubushi Ls2-1780-MITW etc.