5.0mm diameter; .059" to .177" grip range. Application: GM 20423647. Marson® KLIK-LOK plastic rivets are the same precision-molded all-nylon rivets used by domestic auto manufacturers. As they set, three legs form to securely lock the components in place and prevent pullout. Fasten plastic to plastic, plastic to metal and plastic to fiberglass. 20 per box.