13/16" diameter. 5/16" between flat flanges, to fit the SInger 20U (and similar machines) as well as most industrial single needle lockstitch machines, embroidery machines, and quilting machines. Fits Singer 204, 206, 306, 319, 115, 652, 659, Free 503. Turissa, Viking 33, Adler 189A, 289A, 589A, 789A, 989A, Brother 200, Phoenix 282, Anker DZ, FZ, Gloria, Durkopp, Bell 401, Kenmore Rotary, 20V, 188V and 188K. The classic Style L Bobbin.
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