Black Nylon and stainless steel quick-release pins for securely mounting your MAXTRAX on a roof rack or bars. The set includes 4 pins which can securely hold 2 or 4 MAXTRAX, 4 stainless steel Nylock nuts and 4 flat stainless steel washers. There’s a hole in the top of each mounting pin for a padlock. * Designed for MAXTRAX MKII only. (MAXTRAX NOT INCLUDED).