The Tri-Angle Sharpmaker (204MF) includes two sets of high alumina ceramic stones
A pair of medium-grit (brown, in foreground) 7" x 0.5" stones for aggressive sharpening.
A pair of fine (white, upright in base) 7" x 0.5" stones for professional grade finishing.

The stones are triangular for sharpening plain edges on the flat sides, and serrations on the corners.
A furrow running the length of each stone lets you sharpen pointed items like fishhooks, darts and awls.

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 angle (15 each side), or a 40 angle (20 each side) for knives; and a 12.5 scissor setting.

When you 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
Cast in fastener holes for bench mounting
Includes is a set of brass safety rods (shown at the left) to protect users' hands while sharpening
All components snap into the self-contained ABS plastic base and lid
NOTE: Ceramic stones, like glass, will break if dropped -- handle carefully. Replacement stones are available by special order
Use them dry - no oil, water, or lubricants
To clean: scrub stones with a plastic scouring pad and powered abrasive cleaner, let air-dry. Also autoclave safe
Includes instruction book and DVD