Synthrotek's blank panels do more than just fill blank space - they are a DIY wonderland. We added small holes to make drilling and alignment easy. In 4HP and larger, the holes are spaced to fit jacks and potentiometers easily. (2HP panels use Thonkiconn jacks only and will not fit Synthrotek's potentiometers.) When blank panels of any size are placed side-by-side, the geometric designs intersect. If you prefer a black panel, just flip it over, both sides are usable. Empty space never looked so good. Panels designed by Courtney Crews. Please note: Synthrotek Blank Panels are made of fiberglass. Be sure to use a breath mask when drilling holes.