guide plate guide plate /ˈgaɪd ˈpleɪt/

noun

1. A metal plate with an elongated slot for the bight to go through and then a carabiner is attached so that when pull from the climber occurs the carabiner will be pulled to lock off the device.  ( auto-blocking belay device , guide plate )
   a metal plate with an elongated slot for the bight to go through and then a carabiner is attached so that when pull from the climber occurs the carabiner will be pulled to lock off the device.