The bolo, also known as the itak or the sundang, is a Filipino knife similar to a machete, used for cutting grass and brush, opening coconuts, and other mundane tasks, as well as in combat. The bolo's blade widens near the end, moving the center of gravity forward and allowing in to cut with greater force. The bolo was used to devastating effect by guerillas in the Philippines Insurrection of the early 1900s, as well as in the World War II, with some guerilla's carrying no other weapons.