The kit will work where the gap between the two panes is small 6-12mm, you can still drill these however you have to drill slower which will make the drill bit hotter and burn through them faster.. It will be important to keep the drill bit as wet as possible.. If the drill bits do wear faster then additional drill bits can be purchased..
The other key point is to make sure you let the drill do the work and do not put too much pressure on the drill, as you break through the outer pane of glass you don’t want the drill to kit the inner pane….
As always please ensure the windows are not toughened glass as you cannot drill this, we have a toughened glass kit if required.