An assembly comprising: a slide rail kit and a rack, the slide rail kit being applicable to the rack, the rack comprising at least one mounting structure, the at least one mounting structure having a first predetermined portion and a second predetermined portion, the slide rail kit comprising: a rail member; and a supporting bracket comprising a first side, a second side opposite to the first side and facing the at least one mounting structure, wherein the rail member is arranged on the first side, the supporting bracket further comprising a first mounting feature, and a second mounting feature, the first mounting feature being configured to be mounted to the first predetermined portion of the at least one mounting structure of the rack; wherein the second mounting feature comprises an elastic member and a mounting member, the mounting member is arranged on the elastic member, and the mounting member is configured to be mounted to the second predetermined portion of the at least one mounting structure of the rack in response to an elastic force of the elastic member; wherein the at least one mounting structure of the rack comprises a plurality of holes (H1, H2) comprising at least a first hole and a second hole, each hole (H1, H2) is defined by a plurality of walls, the plurality of walls comprises at least a front wall and a rear wall, the front wall of the first hole is the first predetermined portion, and the rear wall of the second hole is the second predetermined portion; wherein the rail member is able to be engaged with the front wall of the first hole through the first mounting feature of the supporting bracket, and the rail member is able to be engaged with the rear wall of the second hole through the second mounting member of the supporting bracket; wherein the first mounting feature is arranged on the second side of the supporting bracket; wherein the first mounting feature of the supporting bracket has a first section and a second section, the second section is bent relative to the first section, the first section is configured to be engaged with the front wall of the first hole. a rail member; and a supporting bracket comprising a first side, a second side opposite to the first side and facing the at least one mounting structure, wherein the rail member is arranged on the first side, the supporting bracket further comprising a first mounting feature, and a second mounting feature, the first mounting feature being configured to be mounted to the first predetermined portion of the at least one mounting structure of the rack; wherein the second mounting feature comprises an elastic member and a mounting member, the mounting member is arranged on the elastic member, and the mounting member is configured to be mounted to the second predetermined portion of the at least one mounting structure of the rack in response to an elastic force of the elastic member; wherein the at least one mounting structure of the rack comprises a plurality of holes (H1, H2) comprising at least a first hole and a second hole, each hole (H1, H2) is defined by a plurality of walls, the plurality of walls comprises at least a front wall and a rear wall, the front wall of the first hole is the first predetermined portion, and the rear wall of the second hole is the second predetermined portion; wherein the rail member is able to be engaged with the front wall of the first hole through the first mounting feature of the supporting bracket, and the rail member is able to be engaged with the rear wall of the second hole through the second mounting member of the supporting bracket; wherein the first mounting feature is arranged on the second side of the supporting bracket; wherein the first mounting feature of the supporting bracket has a first section and a second section, the second section is bent relative to the first section, the first section is configured to be engaged with the front wall of the first hole.