I like the E-Z lap 2pc. diamond sticks with a hook groove. Wal-mart used to carry them, <$10.00 ea., this model:http://www.avidmaxoutfitters.com/p-4673-ez-lap-eze-lap-hook-sharpener.aspx?catargetid=1391382591&cagpspn=pla&gclid=CI6J-u__k7MCFe57QgodG10ALw
Not the best sharpener but good nuff for a knife pocket and it is small enough to touch up most serrated edge's.