Carving Tools used in woodworking or printmaking are useful in carving out wide lines, or whole areas. Different shaped blades (like the ones showed to the right) allow for different techniques. Length, size, shape can all vary in both the blade and handle; chose the one most comfortable for you.
A couple of notes: carving into cool/cold wax can chip the edges where it is carved out; warm the surface before caving. Also wax will stick to cold tools; heat your tool blade and keep it clean with a rag for best results.