Also be careful because if the drill speed is slow, it will want to pull through and if the tires is directly below it,you may damage it. Use a cardboard tube as a drill stop/ depth limiter and tape the fender with masking tape so if the tube spins, it won't scratch. If you're careful, you can drill it easily without anything. Plastic drills easy; just keep the speed up. Also drill a pilot hole first.There are special bits called "Unibit" and it has steps for drilling holes in different sizes.

 

make shuer the drill that you use for your piolet hole is SHARP