The dustick needs a 90 degree angled tip so you can get it into carpenter bee holes behind facia boards. You need to get the drione dust into their entrance holes to be effective. The tip that comes with the dustick is useless for carpenter bee holes that are behind facia boards. I wish their was an option to buy a 90 degree tip. This product it not worth buying for holes behind facia boards unless they offer you a 90 degree angled tip as an option.