Cressi Predator Knife

Con
-The hole on sheath are too small for most of weight belt
Pros
-Good price
-Good size
-Good design
-Easy to disassemble for cleaning
-Extra rubber keeper $4 / strap $7

From Cressi
Small knife very handy and anatomical. 
Its dimensions make it particularly suitable to be stored as spare knife, or for those who like to gear up effectively.