An IDC socket consists of a body and a cover. The injection molded plastic body houses the rows of contacts. The cover is essential to the termination process and protects the terminated contacts in use. Open covers are used where sockets are daisy chained along a section of cable, while closed covers are designed to be located at either end. To ensure the completed wiring harness is plugged the right way into the mating header connector, sockets may come with military polarization slots located at the ends, or a center bump. These correspond to grooves or slots on the header body. Users often try and disconnect sockets from headers by pulling on the cable. This can damage the cable and termination. As a preventative measure, the cable can be folded up and over the top of the cover and an optional strain relief clip can be attached to the socket body. When the user pulls on the cable the clip acts mechanically to spread the stress over the length of the body.