A key tool arranged to decode an internal profile of a lock, said key tool having a longitudinal axis and comprising: - a handle comprising: - a grip; - a translating element for carrying out a relative translation with respect to said grip along said longitudinal axis; - a decoding element passing through said translating element, said decoding element comprising: - a support (3,3') having a first end integral to said translating element and comprising a transversal hole (9,9'); - a laminar body (4,4') integral, with respect to said longitudinal axis, to said grip and arranged to translate with respect to said support (3,3') when said translating element carries out said relative translation with respect to said grip; - a box (11,21) placed in said transversal hole (9,9') and arranged to house a plurality of pins (15,19) arranged parallel to each other and perpendicular to said longitudinal axis, each pin (15,19) arranged to slide with friction along its own direction with respect to said box (11,21); whereby said laminar body (4,4') comprises at least one notch not parallel to said longitudinal axis; and whereby said box (11,21) comprises a protrusion arranged to slide in said notch to make said box translating orthogonally with respect to said longitudinal axis when said laminar body (4,4') translates with respect to said support (3,3'), said key tool being configured in such a way that when said support (3,3') is put in said lock and said translating element carries out said relative translation, bringing said laminar body (4,4') to translate with respect to said support (3,3'), said box (11,21) translates carrying said pins (15,19) to beat against said internal profile of said lock, creating a profile identical to that of an original key of said lock. - a handle comprising: - a grip; - a translating element for carrying out a relative translation with respect to said grip along said longitudinal axis; - a grip; - a translating element for carrying out a relative translation with respect to said grip along said longitudinal axis; - a decoding element passing through said translating element, said decoding element comprising: - a support (3,3') having a first end integral to said translating element and comprising a transversal hole (9,9'); - a laminar body (4,4') integral, with respect to said longitudinal axis, to said grip and arranged to translate with respect to said support (3,3') when said translating element carries out said relative translation with respect to said grip; - a box (11,21) placed in said transversal hole (9,9') and arranged to house a plurality of pins (15,19) arranged parallel to each other and perpendicular to said longitudinal axis, each pin (15,19) arranged to slide with friction along its own direction with respect to said box (11,21); - a support (3,3') having a first end integral to said translating element and comprising a transversal hole (9,9'); - a laminar body (4,4') integral, with respect to said longitudinal axis, to said grip and arranged to translate with respect to said support (3,3') when said translating element carries out said relative translation with respect to said grip; - a box (11,21) placed in said transversal hole (9,9') and arranged to house a plurality of pins (15,19) arranged parallel to each other and perpendicular to said longitudinal axis, each pin (15,19) arranged to slide with friction along its own direction with respect to said box (11,21); whereby said laminar body (4,4') comprises at least one notch not parallel to said longitudinal axis; and whereby said box (11,21) comprises a protrusion arranged to slide in said notch to make said box translating orthogonally with respect to said longitudinal axis when said laminar body (4,4') translates with respect to said support (3,3'), said key tool being configured in such a way that when said support (3,3') is put in said lock and said translating element carries out said relative translation, bringing said laminar body (4,4') to translate with respect to said support (3,3'), said box (11,21) translates carrying said pins (15,19) to beat against said internal profile of said lock, creating a profile identical to that of an original key of said lock.