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    Mitered Corners / Mitered Binding Corners

    Patterns often tell you to stop a ¼” from the edge of the fabric.

    What they really mean is stop right at the seam line, which is a scant ¼”. That’s the secret to sharp mitered binding corners and precise set in seams and the Prep-Tool can help.


    The secret to sharp mitered corners, including mitered binding corners is to stop right at the seam line.

    The Prep-Tool is a Scant ¼” wide and its raised Lip Edges catch the edge of your fabric, so you’ll always mark the exact stopping point every time.


    1) Butt the Lip Edges on the Prep-Tool against the edge of the fabric and mark your stopping point.

    2) Sew up to the stopping point and then at a 45º angle into the corner.

    3) Fold the end of the binding straight up to form a 45º angle.

    4) Keeping the 45º angle underneath, fold the binding back down, and start stitching a scant 1/4" from the edge.

    Measure / Mark Seam Lines
    & Pre-Trim Points Accurately:

    Prep-Tool with 8-page
    booklet & 1 Seam Guide

    Sold out

    Square up the super easy way,
    cut & sew accurately:

    Perfect4Pattern Sets
    that include 1, 2 or 3
    Guidelines Ruler(s).

    Square up the super easy way,
    cut & sew accurately:

    Perfect4Pattern Set
    for regular acrylic rulers
    you already have.

    Make Blocks Any Size
    No Math!


    Finished-Size Quilting Sets

    The Prep-Tool comes with one peel-and-stick, self-adhesive Seam Guide with removable, reusable adhesive. They are 1/32" thick making it easy to align and guide your fabric accuratly before it gets under your needle.

    The Prep-Tool also includes an eight page instruction booklet that you can download to view or print.

    Replacement 6-Packs of Seam Guides are available separately. Click here to get a pack.

    Check the Accuracy of
    Your Scant 1/4"
    Seam Allowances.

    Pre-trim triangles & diamonds

    Learn More.

    Take the guesswork out of
    Set-in Seams

    Learn More.