A wear member for attachment to an excavator on which is fixed a base having a front body. The wear member comprises an opening for receiving a lock, a forwardly projecting working portion, and a rear portion including an interior recess for receiving the front body of the base. The interior recess moreover has a rearwardly facing concave abutting surface adapted to abut a bearing surface on the front body of the base which is curved in two perpendicular directions.