Drill out blind rivet

Fig 1: Identifying Blind Rivet And Drill Bit Diameter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Screw out the screw (1) on the left and right hand sides in the rear edge of the wheel arch. Screw the screw almost entirely out
Press the screw using a screwdriver until the loose end pieces on the inside of the bumper cover are pressed backwards
Drill out the blind rivet (2) that holds the bumper cover at the lower rear edge of the wheel arch on the right and left-hand sides. Use a 5.5 mm (7/32") diameter drill bit.