A kit for a hanging system, which hanging system comprises one or more rails (49, 49a), wherein each rail (49,49a) has parallel walls (52, 52a) projecting from a partition (53, 53a) of the rail (49, 49a), which walls (52, 52a) have edges (54, 54a) at the free ends and which edges (54, 54a) are directed towards each other and are arranged perpendicular to the projecting walls (52, 52a), wherein a distance is formed between the edges (54, 54a), wherein the kit comprises one or more locking elements (1, 1a, 11), one or more connecting pieces and one or more ceiling attachments, wherein each locking element (1, 1a 11) and each connecting piece are either used separately or together and that each ceiling attachment is used together with a locking element (1, 1a, 11), wherein the locking element (1, 1a, 11) is lockable in a desired position along the at least one rail (49, 49a), that the locking element (1, 1a, 11) is placed between the partition (53, 53a) and the edges (54, 54a) of the walls (52, 52a), that the locking element (1, 1a, 11) is pressed between the partition (53, 53a) and the edges (54, 54a) of the walls (52, 52a) in a locked condition for the locking element (1, 1a, 11), characterized in that the locking element (1, 1a, 11) can be received in one of the rails (49, 49a) or in two of the rails (49, 49a) to connect said two rails (49, 49a) to each other, that the connecting piece comprises a plate, a rod and a disc, that said plate and said disc are placed at opposite ends of said rod, that the disc has an outer diameter exceeding an outer diameter of the rod and is fixed to a lower part of the rod in a perpendicular position in relation to the rod, that the plate is connected to a spindle at an upper part of the rod in such a way that the plate may be turned on the spindle between a raised vertical position and a lowered horizontal position, that the plate has cams placed at the connection with the spindle, that the plate has a flared end opposite the end receiving the spindle, that each of the ceiling attachments comprise a house and an attachment element, that said house comprises a through opening for receiving a screw, a flat part, two side walls at opposite sides of the flat part and two flanges at the side walls opposite the flat part, that the side walls are perpendicular to the flat part and the flanges, respectively, that the through opening is placed in the middle of the flat part, that each flange has a curved recess, wherein the curved recesses are placed opposite each other in the area of the through opening of the flat part, that a groove for receiving the attachment element is formed between the free edges of the flanges, that the width of each flange differs on opposite sides of the curved recess, whereby the groove formed between the free edges of the flanges have different widths, giving a comparatively wide groove on one side of the recesses and a comparatively narrow groove on the other side of the recesses, that said attachment element has a central part with an attaching plate on one side and a locking plate on the opposite side of the central part, that the locking plate is connected to the central part by means of an upper rod, that said upper rod has a cross-section with two opposite curved sides and two opposite straight sides, that the outer distance between the curved sides of the upper rod is larger than the outer distance between the straight sides of the upper rod, that the attaching plate of the attachment plate is connected to the central part by means of an elliptic rod, that the attaching plate and the locking plate, respectively, are arranged in parallel with and at distances to the central part, that the attaching plate has the form of two pins projecting from opposite sides of the elliptic rod, that the locking plate of the attachment element is received between the flat part and the flanges of the house, that the outer dimension of the locking plate exceeds the distance between the flanges of the house, that the outer distance between the curved sides of the upper rod (48, connecting the central part of the attachment element to the locking plate, is larger than the distance between the flanges in the wide groove of the house and smaller than the inner distance between the flanges at the recesses and that the outer distance between the straight sides of the upper rod, connecting the central part of the attachment element to the locking plate, is smaller than the distance between the flanges in the wide groove of the house and larger than the distance between the flanges in the narrow groove of the house.