This product provides the versatility to accommodate virtually any sharpening task. Durable polymer base w/lid and additional preset angles. The 40?? angle hones serrated and plain edges. The 30?? angle is designed for thinner blades and back beveling. The 12.5?? 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.