Abstract: A sharpening device is provided that can precisely adjust the angle of sharpening stones for use in a variety of ways and with many different types of knives and tools. The sharpening device has a first holder and a second holder positioned in a base. The first holder, the second holder, and the base may have respective pluralities of apertures, where a single aperture of the holder is aligned with a single aperture of the base at any given time. The first holder and the second holder may include indicia that align with respective apertures of the base. The base may include an angle gauge with a pointer, where the first holder or the second holder may be coupled to each other and/or to the pointer via geared surfaces. The sharpening device may include an actuatable thumb wheel, a base stand, safety rods, and/or securing components.

Abstract: A folding knife having a handle, a pivoting blade guard, and a pivoting blade. Both the guard and the blade pivot on a common pivot pin that is secured to or within the handle. Both the handle and the guard feature at least one arcuate slot that extends in an arc around the pivot pin. A tang pin located in the tang of the blade rides in the arcuate slots and serves as a stop for both the handle and the guard, limiting the range of their rotation on the pivot pin.