"The Tri-Angle Sharpmaker (204MF) includes two
sets of high alumina ceramic stones: A pair of medium-grit (brown) 7" x
.5" (178mm x 13mm) stones for aggressive sharpening and a set of fine
(white) 7" x .5" (178mm x 13mm) stones for professional grade finishing.
The stones are triangular for sharpening Plainedges on the flat sides
and SpyderEdges (serrations) on the corners. A furrow running the length
of each stone lets you sharpen pointed items like fishhooks, darts and
awls. Included is a set of brass safety rods protecting the users hands
while sharpening. All components snap into the self-contained ABS
plastic base and lid -- ready to travel with you.
Die-cut into the base
are keyed slots and holes fitted for the stones. They accurately set the
stone's sharpening angle at a 30° (15° each side) or 40° (20° each
side) for knives and a 12.5°scissor setting. Turn the base over, a
channel lets you lay two stones side-by-side (flat-side up) for use as a
benchstone. The lid snaps halfway over the base creating a handhold for
stability while you're sharpening."