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3x5 Index Card File Box
An open-top desk file box for standard 3x5 in (76 x 127 mm) index cards. The cards stand on their long edge, and the box holds about 77 mm of stock, roughly 400 cards. The 132 mm inner width leaves 2.5 mm of side clearance, and a 44 mm U-shaped notch in the front wall lets you thumb through the deck. The walls are 2.4 mm thick, the outside is 137 x 82 x 52 mm and the box needs no supports.
Breaker Panel 4x6 Directory Card Frame
A slide-in frame that holds a standard 4x6 in (101.6 x 152.4 mm) index card as your circuit directory on the inside of a breaker panel door, so the list stops tearing and falling out when the door swings. The card drops in from the top and sits under two 45° wedge lips, so the frame prints with no supports. Mount it with VHB tape on the flat back, or put M3 or #6 sheet-metal screws through the two 3.4 mm ear holes. The frame is 133 x 157 x 6 mm.
3x5 Index Card Desk Stand
A desk stand for standard 3x5 in (76 x 127 mm) index cards, used for to-do lists, flashcards or recipe cards. The front slot is 131 mm wide and about 14 mm deep, so it holds a stack of roughly 60 cards leaned back 15° where you can read them. A 24 mm deep pocket at the back takes the cards you're finished with. The stand measures 137 x 70 x 61 mm, and the thin-wall plate-and-cheek build keeps the plastic volume down.