Carlisle SynTec Systems’ 3-Inch Square Metal Plate is a 0.024-inch (0.6 mm) thick, 3 x 3 inch (76 x 76 mm) square Galvalume® plate. Galvalume has proven weatherability and resiliency. Carlisle’s 3-Inch Square Metal Plates are packaged and sold in quantities of 500.Carlisle’s 3-Inch Square Metal Plates are stamped to include a recessed ¼ inch (6.4 mm) diameter hole in the center and a series of ribs for added strength.The configuration of the ribs and the hole is used to prevent the screw head from coming into contact with the roofing membrane.