Abstract: Tool post with tool (9) for metal cutting work of a hollow space, said tool (9) being clamped between a support (3) and a clamp (12) with the support (3) attached to a carrier (1), the support (3) over its entire length as well as the clamp (12) being curved, said curvature (6,22) having a center line parallel to the longitudinal axis of the tool (9) in a plane through the cutting edge (8) of the tool (9) and inside the cutting circle of the tool, preferably carrier (1) and support (3) being designed such that support (3) and clamp (12) can be placed on either side of the carrier (1).