This bracket fits a nominal 6" wide shelf; the top is just under 5" deep (124 mm). The screw holes are angled for easier access around the gear hub. Relief features provided to clear drywall anchors in the back, and to help the shelf sit flat on the top, in case your print isn't perfectly flat. All overhangs (other than screw holes) are at 45 degrees or less, though there's a little bit of bridging in the interior of the gear.