46 passing by the handle of the tool that is an angle u03c4 wider than 90 u00b0 bringing the s shape 54 within the first longitudinal axis 46 of the handle of the tool in summary the scaling tool 32 fig1 for the removing of unstable rocks comprises an anvil 56 fig3 comprising an elongated body 58 along a first longitudinal axis 46 and two extremities the elongated body adapted to be displaced longitudinally with non rotative means for sliding a penetrating portion 33 fig2 comprising a penetration point 44 an angular stem 48 and an s shape 54 the penetration point 44 comprising a second longitudinal axis 114 and two ends the angular stem 48 comprising a third axis 50 a length 52 and two sides the s shape 54 between junction end 60 and the start of the angular stem 48 being elongated the end extremity 112 usually wedge shaped fig5 of the penetrating point being directed axially 114 toward unstable rocks the second extremity 113 being connected along a primary angle u03b1 in a concave manner 118 to angular stem 48 a first surface of the stem substantially forming a back 116 convex acting as a wedge relatively to the primary axis 114 and a second surface forming.