Add-on grip and actuation-sleeve for a pen-type drug injection device

An attachment for an operable drug delivery device,

• comprising a gripping sleeve member that is configured to receive a first member of the operable drug delivery device,
• wherein the gripping sleeve member comprises a first gripping sleeve member part comprising a first engagement feature at its inner surface that is configured to engage the first gripping sleeve member part in a torque-proof manner with the first member of the operable drug delivery device and wherein the attachment comprises a torque limiting mechanism defining a maximum allowed torque, wherein the torque limiting mechanism comprises a clutch member configured to slip when a torque greater than the maximum allowed torque is applied to the first gripping sleeve member part.