The 4 way - corner connector is made of nylon and is used with a Quick Frame profile which has built-in ridges that bite into the fastener to create tension without the use of additional hardware. It provides flush connections of up to four Quick Frame profiles, forming 90 degree or 180 degree connections. The 4 way - corner connector is convenient when you want to branch another profile off of a corner or straight line. The 4-way corner connector is commonly used when transitioning between standard and flanged profiles and uses only a soft-faced mallet to form light-duty yet sturdy builds. It requires no machining services or additional hardware.