DRILLING TOOL AND ABUTTING PART FORMING BODY THEREFOR

摘要

PROBLEM TO BE SOLVED: To safely perform a drilling work by preventing a drilling blade from being when a drilled body is passed through without providing a chip receiving cover with a possibility of being a hindrance of a drilling work. SOLUTION: This drilling tool 1 for drilling a through-hole in a wall material by a pair of independently projecting drilling blades 7 rotating around a center shaft 4 is provided with an abutting flange 23 which is inserted into a cutting groove of the wall material cut by the drilling blades 7 at the time of a drilling, is abutted on an internal surface of the through-hole when the wall material is passed through and is capable of preventing the drilling blades 7 from colliding with the internal surface of the through hole and an abutting piece 24 abutting on a peripheral edge of the through-hole of the wall material to prevent excess pushing than required of the drilling blades 7 into the wall material.