Description

For model 300, 400 and 500 series Singer sewing machines.

A scant 1/4″ seam is about three fibers (in the cotton fabric) shy of a full 1/4.”

The scant quarter inch seam allowance leaves enough room to allow for the “fabric bulk” so when the seam allowance is pressed to one side, the units will still measure properly and the block isn’t too small.