A fixture for fixation of e.g., a downlight in a hole in a ceiling or a wall, which fixture comprises: • an annular flange, having a center axis (y), an inner side, and an outer side (2"), said annular flange being for abutment on one side of the ceiling or wall around the hole so that the annular flange lies substantially coaxially with the hole while the annular flange encircles the hole; • a support member having a centre axis, an inner side, and an outer side (3"), said support member being for abutment on the other side of the ceiling or wall around the hole, the support member is manipulatable between a first and a second configuration, the first configuration being as an annular member having a flat bottom that defines an - essentially - circular unbroken surface, the first configuration being for abutment on one side of the ceiling or wall around the hole so that the support member lies substantially coaxially with the hole while the support member encircles the hole, the first and second configurations being adapted such that the support member can be passed through an hole when it forms the second configuration and encircles the same hole when it forms the first configuration as an annular member; • fastening means provided on said support member; • fastening means provided on said annular flange being mutually adapted to said fastening means on the support member such that the support member and the annular flange can be assembled in a releasably manner; wherein the support member comprises two essentially identical semi-circular pieces (10,11), characterized in that the two essentially identical semi-circular pieces are hinged together such that the hinge enables the ends (20, 21) opposite the hinge to be moveable towards and away from each other and where the second configuration is obtained when the ends of the two essentially identical semi-circular pieces are moved together. • an annular flange, having a center axis (y), an inner side, and an outer side (2"), said annular flange being for abutment on one side of the ceiling or wall around the hole so that the annular flange lies substantially coaxially with the hole while the annular flange encircles the hole; • a support member having a centre axis, an inner side, and an outer side (3"), said support member being for abutment on the other side of the ceiling or wall around the hole, the support member is manipulatable between a first and a second configuration, the first configuration being as an annular member having a flat bottom that defines an - essentially - circular unbroken surface, the first configuration being for abutment on one side of the ceiling or wall around the hole so that the support member lies substantially coaxially with the hole while the support member encircles the hole, the first and second configurations being adapted such that the support member can be passed through an hole when it forms the second configuration and encircles the same hole when it forms the first configuration as an annular member; • fastening means provided on said support member; • fastening means provided on said annular flange being mutually adapted to said fastening means on the support member such that the support member and the annular flange can be assembled in a releasably manner;