The comb of your stock, the very top where your cheek rests, is a critical factor for proper sight-plane. It can be made fully adjustable. The Seitz Adjustable Comb Kit is high-quality machined brass hardware. With it installed, your comb becomes fully and easily adjustable -- side-to-side as well as up and down. You can make the adjustments in the field to accomodate your clothing and conditions. All gauges, all size shotguns. You will be amazed at the improvement in your shooting. This product will require gunsmith expertise for a perfect fit.