An adjustable arm for holding a driver interface of a lift-truck, comprising a base configured to be attached to a lift-truck; an elongate housing pivotally attached to the base around a first axis; an arm body axially movable in the housing along a second axis and; a holder for a driver interface pivotally attached to the arm body around a third axis, and; - a locking linkage configured to engage the base and the arm body and comprising a lever for manual operation of the locking linkage between a locked position A in which the locking linkage is in locking engagement with the base and the arm body and an unlocked position B in which the locking linkage is out of engagement with the base and the arm body, wherein the adjustable arm is arranged such that when the locking linkage is in: - the locked position A, the housing is fixed to the base, the holder is fixed to the end of the arm body and the arm body is fixed in the housing and in - the unlocked position B, the housing is pivotal around the first axis, the arm body is movable in the housing along the second axis and the holder is pivotal around the third axis characterized in that; - the base comprises engagement means (1.1) and; - the arm body comprises a first body portion having engagement means (5.1, 5.2) and that is arranged axially movable in said housing; and a second body portion having engagement means (6.1) and that is arranged axially movable in said first body portion; and wherein the holder for a driver interface is pivotally attached to said first and second body portion (5, 6) and; - the locking linkage comprises a first linkage section having engagement means (8.1) for engaging the engagement means (1.1) of the base and a second linkage section having engagement means (9.1) for engaging the engagement means (5.1, 5.2, 6.1) of said first and second body portion (5, 6). - a locking linkage configured to engage the base and the arm body and comprising a lever for manual operation of the locking linkage between a locked position A in which the locking linkage is in locking engagement with the base and the arm body and an unlocked position B in which the locking linkage is out of engagement with the base and the arm body, wherein the adjustable arm is arranged such that when the locking linkage is in: - the locked position A, the housing is fixed to the base, the holder is fixed to the end of the arm body and the arm body is fixed in the housing and in - the unlocked position B, the housing is pivotal around the first axis, the arm body is movable in the housing along the second axis and the holder is pivotal around the third axis characterized in that; - the base comprises engagement means (1.1) and; - the arm body comprises a first body portion having engagement means (5.1, 5.2) and that is arranged axially movable in said housing; and a second body portion having engagement means (6.1) and that is arranged axially movable in said first body portion; and wherein the holder for a driver interface is pivotally attached to said first and second body portion (5, 6) and; - the locking linkage comprises a first linkage section having engagement means (8.1) for engaging the engagement means (1.1) of the base and a second linkage section having engagement means (9.1) for engaging the engagement means (5.1, 5.2, 6.1) of said first and second body portion (5, 6).