A computer blade for a rackable server includes a chassis that can be inserted into the rackable server along a reference axis, the chassis including two longitudinal faces and at least one transverse face; two lever arms, each lever arm being fixed to the chassis through a pivot link such that each lever arm is capable of pivoting relative to the transverse face between a lock position in which the lever arm extends parallel to the transverse face and a release position in which the lever arm forms an angle from the transverse face, each lever arm including a first end with at least one transverse tab projecting from one of the longitudinal faces of the chassis when the lever arm is in its lock position, the two lever arms being fixed to each other through a sliding pivot link.