A kaiser blade, or sling blade, is a heavy, hooked, steel blade at the end of a 40-inch (100 cm) handle that is usually made of hickory. It is used to cut brush, briar, and undergrowth. The blade is double-edged, and both sides are usually kept sharp. Other common names for this tool are ditch bank blade, briar axe, and surveyor's brush axe. [Wikipedia]
"So, I takin' the kaiser blade; some folks call it a sling blade, I call it a kaiser blade; and I hit my mother up side the head with it. Killed her." Karl Childers - "Sling Blade"