GRK screws are about as bullet proof as you can get in a screw,,,,supposed to be 5 times stronger than a 1/2 lag screw...I believe it is....They are annodized and don't corrode...We usually buy them by the case because they are not cheap.
If you are looking for something like a SIPS screw then Home Depot started carrying a new line last year....The name escapes me right now buy we buy them in lieu of Olys they have a better drive head than Olys
