A fuller's principal function is to lighten the blade; lighter swords are easier and faster to handle. Variations in fuller qualities may also have an impact on the weight balance and associated features of the blade. For example, a sword with more robust fuller bones will be heavier and less likely to tip over if you hit something. Some swords have markings indicating where to file down the blade to produce a finer point. These are called "finesse points". The term comes from the fact that they are useful for finishing cuts, not thrusting. They are generally found on weapons intended for use by non-combatants, such as courtiers or guardsmen. Guards used finesse points because they were less likely to cause injury when defending themselves or their masters' families/property. Some swords have markings indicating where to grind the edge of the blade so it can be used as a cutting tool as well as a weapon. These are called "edge tools". Edge tools can be used for cutting ropes, leather, etc. They are generally found on weapons intended for use by soldiers on the battlefield. The term "edge" does not refer to the edge itself but rather the entire surface from heel to tip. Thus, an "edge" sword has a flat surface at each side of the blade where filing or grinding would take place.