A releasable fastening device , comprising a socket , an engagement structure , a first lever arm , and a second lever arm , wherein the socket is configured for being inserted into an opening of an object from a first side of the object , wherein the first lever arm is pivotably attached to the socket in a first pivot point and the second lever arm is pivotably attached to the socket in a second pivot point , wherein the first lever arm is slidably connected to the engagement structure and the second lever arm is slidably connected to the engagement structure , wherein the fastening device is configured for being movable between a mounting position (P M ) in which the fastening device is insertable into the object and a fastening position (P F ) in which the fastening device is attached to the object , wherein the first lever arm comprises a first attachment surface and the second lever arm comprises a second attachment surface , wherein the first attachment surface is configured for engaging a first engagement surface arranged on a second side of the object in connection to the opening in the fastening position (P F ), and wherein the second attachment surface is configured for engaging a second engagement surface arranged on the second side of the object in connection to the opening in the fastening position (P F ), wherein the first lever arm comprises a first arm section extending between the first pivot point and a first arm end , wherein the first arm end is slidably connected to the engagement structure ; and wherein the second lever arm comprises a second arm section extending between the second pivot point and a second arm end , wherein the second arm end is slidably connected to the engagement structure , characterized in that the first arm section and the second arm section are configured to be positioned in an X-like configuration in relation to each other in the fastening position (P F ). wherein the first lever arm is pivotably attached to the socket in a first pivot point and the second lever arm is pivotably attached to the socket in a second pivot point , wherein the first lever arm is slidably connected to the engagement structure and the second lever arm is slidably connected to the engagement structure , wherein the fastening device is configured for being movable between a mounting position (P M ) in which the fastening device is insertable into the object and a fastening position (P F ) in which the fastening device is attached to the object , wherein the first lever arm comprises a first attachment surface and the second lever arm comprises a second attachment surface , wherein the first attachment surface is configured for engaging a first engagement surface arranged on a second side of the object in connection to the opening in the fastening position (P F ), and wherein the second attachment surface is configured for engaging a second engagement surface arranged on the second side of the object in connection to the opening in the fastening position (P F ), wherein the first lever arm comprises a first arm section extending between the first pivot point and a first arm end , wherein the first arm end is slidably connected to the engagement structure ; and wherein the second lever arm comprises a second arm section extending between the second pivot point and a second arm end , wherein the second arm end is slidably connected to the engagement structure , characterized in that the first arm section and the second arm section are configured to be positioned in an X-like configuration in relation to each other in the fastening position (P F ). <EOS>