The present invention concerns compositions and methods for the treatment of cancer. The process includes an additional spreading station which spreads fine particles onto the upper and lower covering layers to obtain slip-resistant textured surfaces. The first interface portion is coupled to the second interface portion. The first and second housings 1, 2 include respective contact surfaces 12, 22, which are pressed against each other in the open state, thereby maintaining a posture of the second housing 2 relative to the first housing 1. The driven surface and the trailing surface extend substantially parallel to the longitudinal axis defined by the fastener body.