Sewing bobbin block 110 mm - 12 blind round wells 21.4 mm, three rows of four

Sewing box block, 110 x 74 mm and 16 mm tall, hollowed by twelve BLIND round wells of 21.4 mm at a 23 mm pitch both ways, three rows of four, 12 mm deep, over a 4 mm solid floor. - 1.6 mm of material between two wells, 9.8 mm of rim left and right, 3.3 mm front and back -- twelve wells, one file, one piece - MEASURED ON THE MESH: twelve wells at mid-height, ZERO openings below the floor - A class 15 (A-style) bobbin is 20.3 to 20.5 mm across and 11 mm tall: it stands in a 21.4 x 12 mm well, fla…

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