Spyderco's Tri-Angle Sharpmaker includes two sets of high Alumina Ceramic 7" stones: medium grit for aggressive sharpening and fine grit for professional-grade finishing. Stones fit into keyed holes and a set of brass safety rods protect the user's hand during sharpening. The triangular shape allows honing of serrated and plain edges. Slots molded into the polymer base have a 40- and 30-degree angle for knives and a 12.5-degree scissor setting. A groove running the length of the stone is for sharpening pointed objects like darts, awls and fishhooks while a channel on the flipside allows for a bench stone-type set up. Includes instruction book and video.
Specifications:

Type	Sharpening System
Open Length	7"
Sheath	Polymer
Handle Description	Synthetic Black
Sharpener Material	High Alumina Ceramic
Sharpener Type	Medium, Fine
Closed Length
	7"
	High Alumina Ceramic Stones
	Medium and Fine Grit