D Style enclosures are characterized by a rugged one-piece seamless extruded tube. The tube contains multiple tracks for printed circuit boards. Access to the interior is through the ends.

The standard finish on D Style tubes is finely-textured powdercoat paint. It is durable and available in several colors.

Depending on application, optional finishes can be considered. Iridite can be used when surface conductivity is required. Anodize can be used when durability is needed at a lower price. Neither is suitable when cosmetics are a primary concern.

Non-skid feet, which prevent the unit from sliding on flat surfaces, are optional on D Style enclosures. When this option is selected, the feet are applied to the extruded tube prior to shipping.