depends on who u get from, generally adhesive r used but for
some Japanese made ones, there mebbe a couple of fixing clips to
hold it better.
no drilling of holes needed.
to fix, prepare the visor w/o tearing the adhesive backing 1st.
compare against window to make sure it fits.
next, wash with cloth to clean the door surface. next add soapy
water to the same area. dun clean off.
tear both ends of the backing to abt 50mm, lifting the tail of the
backing paper upwards.
stuck in the visor in position, once u position properly, pull the
tail towards center of visor both direction, making sure u press
down the visor and it does not move.
then pull the entire backing off.
for those with clips, there should b standing instructions so
follow them.