Twybils are a hand tool used for green woodworking. It is used for chopping out mortises when timber framing, or making smaller pieces such as gates. It combines chopping and levering functions in a single tool. The appearance of Twybils are that of a T-shaped double-edged axe with unusually long blades and a very short handle. This appearance is deceptive, as they are actually derived from a large double-ended chisel with a side handle added for better control. The geometry of a twybil, particularly the long straight blades, makes it unworkable as an axe.