Tactical knives are designed for work such as setting traps, cutting branches and skinning animals. Most survival knives have blades that are 4 - 6 inches long with a full thick tang. Survival knives made by Aitor, Lile, Parrish, Randall, or Reeve have hollow handles, which allow the user to store additional equipment in the handle. Some of these knives feature a compass in the cap. On some survival knives, the spine or back of the blade is flat; allowing it to make a good hitting platform when pounding it with a hard stick to aid in splitting wood. See also the section combat knife.