This new closing plate is the pinncale of years or experience and frustration with other tools currently on the market. After thousands of packjobs we refined this product to where it is today. The grove in the front locks the size 0 grommet in place, so the plate can't slip off it, thus preventing grommet and container damage. The angle in the front is flatter allowing for easier pinning at more angles. Anodizing prevents aluminum ruboff on light colored containers.