Middle Channel Size:0.53" (W) x 0.38" (H).Due to the soft nature of PVC, there is a slight deviation (0.03mm) in the aperture of the floor cable cover, but it does not affect normal use. 5 Channel Design:Middle Channel Size=0.53" (W) x 0.38" (H).This floor cable cover is designed with 5 holes, the large hole in the middle is 0.53*0.38 inches, and the 4 small holes on both sides have a radius of 0.4 in and 0.17in, which can accommodate smaller-sized wires such as data cables. Indoor and Outdoor:Based on the design of this wire protector,it can be used indoors such as bedrooms,living rooms and offices,and it can be used outdoors either,such as courtyards and lawns,it's thick enough that you can drive over this,so it also called outdoor cable cover. Installation Method:Take out the floor cable cover and spread it out.Due to the properties of PVC,it has to be placed for a period of time to make it flat.Use a knife to cut along the groove on the back,and th