The Slide Guide gives you 2 points of contact on the knife. This improves blade stabilization and allows quicker, more repeatable blade placement. One piece extends from one edge of the blade table to the other, while the center piece slides back and forth independently and can lock in to position to accommodate a wide variety of blade shapes and sizes. It works well by itself, but when combined with a magnetized blade table it makes sharpening on the Edge Pro knife sharpener easier than ever before. The Slide Guide is machined from 6061 T6 aluminum, and has a .002" thick hard anodized coating to protect it from wear and tear over time. A high quality accessory to add to your knife sharpening kit and arsenal of sharpening supplies.