A manual drilling tool for drilling one or more coupled elements, comprising: • an engagement chuck apt to be tightened in the spindle of a tool machine to drag said tool in rotation; • a point body with tool diameter having at least four helical grooves developing longitudinally on the point body and defining at least two primary cutters (30a and 30b) and at least two secondary cutters (31a and 31b); said two primary cutters forming a tip angle (γ); said secondary cutters (31a, 31b) having a discharge surface S; said discharge surface S being shaped so as to create an interruption between the secondary cutters and the primary cutters by contributing to reduce the operator's effort, to reduce the temperature and to promote the discharge of the worked material, wherein said point body is formed by a substantially cylindrical first portion and a substantially conical second portion with taper towards the end of the tool, characterised in that the manual drilling tool provides a coning variation with three coning angles (μ1, μ2, μ3) defined as angles formed by tangents to outer profiles of the cutters with an axis of main extension of the drilling tool, wherein said primary and secondary cutters (30a, 30 b, 31a and 31b) form: • the first coning angle (μ1) comprised in a range between 2 and 10 degrees for a length of a first cutter tract comprised between 6 and 14 mm starting from the distal end of the drilling tool; • the second coning angle (μ2) comprised in a range between 1 and 7 degrees for a length of a second cutter tract comprised between 2 and 9 mm starting from the above-mentioned first cutter tract; and • the third coning angle (μ3) comprised in a range between 0 and 6 degrees for a length of a third cutter tract comprised between 2 and 9 mm starting from the above-mentioned second tract. • an engagement chuck apt to be tightened in the spindle of a tool machine to drag said tool in rotation; • a point body with tool diameter having at least four helical grooves developing longitudinally on the point body and defining at least two primary cutters (30a and 30b) and at least two secondary cutters (31a and 31b); said two primary cutters forming a tip angle (γ); said secondary cutters (31a, 31b) having a discharge surface S; said discharge surface S being shaped so as to create an interruption between the secondary cutters and the primary cutters by contributing to reduce the operator's effort, to reduce the temperature and to promote the discharge of the worked material, wherein said point body is formed by a substantially cylindrical first portion and a substantially conical second portion with taper towards the end of the tool, • the first coning angle (μ1) comprised in a range between 2 and 10 degrees for a length of a first cutter tract comprised between 6 and 14 mm starting from the distal end of the drilling tool; • the second coning angle (μ2) comprised in a range between 1 and 7 degrees for a length of a second cutter tract comprised between 2 and 9 mm starting from the above-mentioned first cutter tract; and • the third coning angle (μ3) comprised in a range between 0 and 6 degrees for a length of a third cutter tract comprised between 2 and 9 mm starting from the above-mentioned second tract.