A normal needle plate has a "slot" where the needle goes in (allowing for change of stitch width) so the needle can wiggle about a bit. The straight stitch needle plate has a tiny hole where the needle goes, so you get a more precise stitch formation. It's perfect for stitching the small Ohio Star blocks where you need to be very accurate. The single hole plate will help stabilize the fabric and keep your stitching lines straighter. Plus, it avoids "eating" up the beginning edges of your seams. I bought one of these plates a few years ago, and really noticed a difference, especially when machine stitching small blocks. Along with using a very fine machine sewing needle (such as a Microtex size 60) and a fine thread (my favourite is Aurifil 50wt for machine piecing) it all helps with accurate precise results! The Bernina needle plates are really easy t change over, and simply "pop" out by pressing on the upper right hand corner. Just remember to change back to a normal needle plate when you want to alter the needle position or the stitch width!