A clamping apparatus (1) for a pole for axially fastening in a releasable manner an inner pipe segment (3) that can be inserted into an opening of the clamping apparatus. The clamping apparatus comprises a two-part plastic sleeve (5), which can be fastened to an outer pipe segment (2). The clamping apparatus also comprises a slotted clamp (16), which surrounds and clamps the plastic sleeve and which has a clamping lever (4), a lever arm (9) of which has an eccentric rolling region (8), by which the distance between a stop (12) and a counter surface (27) arranged on the outside of the first projection (13) can be reduced for clamping by pivoting the clamping lever (4) into the closed position.