A centralizer includes a body having a bore with an axis, the bore being configured to receive a tubular to be centralized, the body having at least one resilient device configured to extend radially from the axis of the bore, wherein the body has at least one collar member extending radially inwards from the centralizer body adjacent to an end of the body. The collars are fixed co-axially in the bore to be resistant to axial movement of the collar member, and can be retained in the body by radially extending a lip formed by forcing material radially inwards into the bore to retain the collar. The body is adapted to receive within the bore an anchoring device for connection to the tubular. The anchoring device is configured to engage the collar member within the bore so that relative movement of the centralizer and the tubular is restricted.