The 4 hole - aluminum hinge is commonly used to mount lighter weight doors or two profiles. It is a cost-effective option that is corrosion-resistant, making it useful for outdoor applications where hinges may rust or corrode. There are options available that can be used as a transition from 10 to 15 series or 25 to 40 series profiles. Additional Information: The gap distance between profiles for 10 series is .062", 15 series is .120" 25 series is 1.97mm, 40 series is 1.15mm and for series transitions is .125" (2.42mm).