The Pure transmission 104-D duplex Receptacle Cover Plate is finished in carbon and glass fiber with stainless steel screws. This plate cover has been designed for use with Furutech’s state-of-the-art GTX-D receptacle but will enhance the performance of any standard size dual AC receptacle. 104 series: Stainless Fixed Screw/Size:# M4 X 12mm(L) Carbon fiber and Grass fiber finished Brass cover Cover Size:71X116 mm(t:2.3mm ± 0.1mm)