Hand-drilling tool. Types like Mitsume-kiri (three-point) and Yotsume-kiri (four-point) are used to cleanly bore starter holes for nails (kugi) without splitting the wood. The twisted body of a Mitsume-kiri cuts and clears chips simultaneously. Indispensable in Japanese woodworking where pre-boring for nails and screws prevents splitting in delicate joinery.