Gear unit adapted for use in a handheld power tool comprising a motor, an output shaft and a gear unit arranged between said output shaft and a drive shaft connected to said motor, wherein said gear unit comprises: a gear input shaft adapted to be driven by said motor, a gear output shaft adapted to engage said output shaft, and a gear unit subassembly comprising: a sun gear arranged on and co-rotating with said input shaft, an outer element comprising an internal ring gear, at least one planet gear arranged between said sun gear and said internal ring gear, and adapted to transfer rotational movement there between, and a planet carrier, wherein the gear unit further comprises a first freewheel clutch mechanism and a second freewheel clutch mechanism, each adapted to selectively transfer torque to said gear output shaft, wherein said first freewheel clutch mechanism is arranged to selectively provide a first torque transferring connection between said gear input shaft and said gear output shaft bypassing said gear unit subassembly and wherein said second freewheel clutch mechanism is arranged to selectively provide a second torque transferring connection between said drive shaft and said gear output shaft via said gear unit subassembly, wherein said first freewheel clutch mechanism provides said torque transferring connection when said gear input shaft rotates in a first direction and wherein said second freewheel clutch mechanism provides said second torque transferring connection when said gear input shaft rotates in a second, opposite direction characterized in that the outer element comprises an outer cylindrical surface and on the inside comprises a first cylindrical portion adapted to receive an outer cylindrical surface on the second freewheel clutch mechanism and a second portion constituting the internal ring gear cooperating with the at least one planet gear. wherein said gear unit comprises: a gear input shaft adapted to be driven by said motor, a gear output shaft adapted to engage said output shaft, a gear input shaft adapted to be driven by said motor, a gear output shaft adapted to engage said output shaft, and a gear unit subassembly comprising: a sun gear arranged on and co-rotating with said input shaft, an outer element comprising an internal ring gear, at least one planet gear arranged between said sun gear and said internal ring gear, and adapted to transfer rotational movement there between, and a planet carrier, wherein the gear unit further comprises a first freewheel clutch mechanism and a second freewheel clutch mechanism, each adapted to selectively transfer torque to said gear output shaft, wherein said first freewheel clutch mechanism is arranged to selectively provide a first torque transferring connection between said gear input shaft and said gear output shaft bypassing said gear unit subassembly and wherein said second freewheel clutch mechanism is arranged to selectively provide a second torque transferring connection between said drive shaft and said gear output shaft via said gear unit subassembly, wherein said first freewheel clutch mechanism provides said torque transferring connection when said gear input shaft rotates in a first direction and wherein said second freewheel clutch mechanism provides said second torque transferring connection when said gear input shaft rotates in a second, opposite direction characterized in that the outer element comprises an outer cylindrical surface and on the inside comprises a first cylindrical portion adapted to receive an outer cylindrical surface on the second freewheel clutch mechanism and a second portion constituting the internal ring gear cooperating with the at least one planet gear. a sun gear arranged on and co-rotating with said input shaft, an outer element comprising an internal ring gear, at least one planet gear arranged between said sun gear and said internal ring gear, and adapted to transfer rotational movement there between, and a planet carrier, wherein the gear unit further comprises a first freewheel clutch mechanism and a second freewheel clutch mechanism, each adapted to selectively transfer torque to said gear output shaft, wherein said first freewheel clutch mechanism is arranged to selectively provide a first torque transferring connection between said gear input shaft and said gear output shaft bypassing said gear unit subassembly and wherein said second freewheel clutch mechanism is arranged to selectively provide a second torque transferring connection between said drive shaft and said gear output shaft via said gear unit subassembly, wherein said first freewheel clutch mechanism provides said torque transferring connection when said gear input shaft rotates in a first direction and wherein said second freewheel clutch mechanism provides said second torque transferring connection when said gear input shaft rotates in a second, opposite direction characterized in that the outer element comprises an outer cylindrical surface and on the inside comprises a first cylindrical portion adapted to receive an outer cylindrical surface on the second freewheel clutch mechanism and a second portion constituting the internal ring gear cooperating with the at least one planet gear.