Small enough to be portable, big enough and with enough features to do a efficient and complete job of maintaining or restoring a knife edge to shaving sharp.
It has two diamond lapstones, one coarse and one fine. 2 ceramic hones and one leather hone.
The built in angle guides help ensure a consistent bevel. Restoring a dulled or damaged blade edge can be done beggining with the coarse lapstone before moving to the fine lapstone and for general maintenance the fine stone may be all that is required before taking the burrs off with the hones and polishing the edge with the leather.
It has a robust and durable feel to it and comes with a limited lifetime warranty.