I designed and printed these cable holders while working on some wiring in my car. Enough people commented that they liked them and wanted them... So here they are. The hole in the center is sized to use a self tapping screw with 5/16 head or use a 5/32 rivit. Keep away from areas that exceed 150 degrees F (65*C). I can ship up to 10 in a little bubble envelope so be sure to select the quantity you want, plus a few extra. Cause we all know what happens when you get the exact amount you think you need.