THE 3 HOLE - RECESSED STRAIGHT PIVOT PLATE IS AN EXTERNAL CONNECTION METHOD THAT IS INTENDED TO BE USED IN PAIRS TO CREATE A CUSTOM ANGLE BETWEEN PROFILES. THE RECESS REPLACES THE NEED FOR A NUB IN A PIVOT ASSEMBLY. THIS FASTENING OPTION PROVIDES A LONG-LASTING CONNECTION AND REQUIRES NO MACHINING SERVICES. IT CAN BE EASILY ASSEMBLED, LENDING ITSELF TO REPOSITIONING AND REUSE. THE SUGGESTED MOUNTING HARDWARE FOR THE 3 HOLE - STRAIGHT PIVOT PLATE WITH RECESS CAN BE FOUND ON THE "SUGGESTED HARDWARE" TAB. HELPFUL HINT: USE DOUBLE SLIDE-IN ECONOMY T-NUT BOLT ASSEMBLIES TO SAVE TIME AND MONEY. TIP: PRE-LOAD YOUR HARDWARE PRIOR TO CONNECTING PROFILES TO SIMPLIFY YOUR ASSEMBLY AND SAVE TIME.,