Explain the types of button hole that sewing machines can stitch

Keyhole Buttonholes

This buttonhole has a bar tack at one end and a round opening at the other edge.

The keyhole accommodates the shank of the button nicely with out pulling on the buttonhole. It is a strong buttonhole suitable for suit jackets and coats in medium to heavy weight fabrics. The opening for the keyhole can be cut after the button hole has been stitched by using a small eyelet punch.

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