To provide a saw-blade-shaped hole capable of rapidly piercing a vinyl material laid in a ridge of a bamboo by cutting or cutting a saw-tooth-shaped drilling blade portion into an inverted triangular shape having its top as a base, A drilling body having an opening edge portion formed in a continuous shape is provided.SOLUTION: A trapezoidal portion is formed in a continuous manner from the left end portion to the right end portion as a lower edge portion 4 constituting the main body a made of a metal plate, and the truncated portion is excised in an inverted triangle shape Or cut off to form a saw blade shaped blade portion 9 in an articulated manner.(FIG.【課題】頂部を底辺とする逆三角形状に切除又は切り落して鋸刃形状の穴開け刃部を連接形成し、畠の畝に敷込んだビニールをカットし、迅速に突刺できる鋸刃形状の穴開け刃部を連接状に形成した穴開け本体を提供する。【解決手段】金属板製穴開け本体aを構成する下方縁部4にして、且左端部より右端部にかけて台形状部を連接状に形成せしめ、前記台形状部の頂部に逆三角形状に切除もしくは切り落して鋸刃形状の刃部9を連接状に形成せしめた。【選択図】図7
