Application Truck Cap Shell Shed Door Shed Door Fence Gate Shed Door Garage Door. Easy to Install：Base on the L/R label or lock/unlock by yourself test to identify L/R lock at first; 2nd insert the truck camper t-lock rod through the install hole, adjust the hole size if needed; 3rd security the install screws to ensure cap t-locks firmly fixed on the truck camper door, then install your old locking cam correctly and tighten the screws.