This product provides the versatility to accommodate virtually any sharpening task. Durable polymer base w/lid and additional preset angles. The 40Â° angle hones serrated and plain edges. The 30Â° angle is designed for thinner blades and back beveling. The 12.5Â° angle allows for scissors sharpening. A bench stone is created by inserting two ceramic stones in the slots of the underside of the base for sharpening items such as pinking shears. Comes with easy-to-follow instructional book and video. This system enables even the inexperienced to attain professional sharpening results with ease.