The Square top-mount Pedestal has an 8" square mounting plate for accommodating large, heavy PTZ Cameras and devices. This pedestal has a 4" base that bolts on top of any 4" Strong Pole, using 5/8" bolts. The base and the pedestal mount are connected via a 4-1/2" long, 1-1/4″ ID tube that allows wiring to be passed thru into the pole (if needed). This mount is also commonly used in conjunction with a Power Supply Box or Equipment Cabinet, and wiring is usually routed directly from the camera or device into the box or cabinet.