Should use keydown(6) instead of hardcoded keys, while your at it.
Instead of keeping the last parameter blank, maybe include some sort of unique id to make sure that it receives the right trigger on the serverside, but it shouldn't be a problem, maybe if you have multiple drops stacked in one spot.
Also setTimer(0.01) is too fast and un-needed since Graal operates @ 20 frames / second thus setTimer(0.05) is the shortest time you'll need. But I think you might of just typo'd and intended to use setTimer(0.1);
And.. instead of using a client variable in range, you should probably use a this. variable, then it won't have to update it with the server. Not to mention if you dropped multiple classes you'd pick them all up with one grab. :P