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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.
Business Card Stand With Pen Trough
This desk stand has a 92 mm wide card well tilted back 15°. It fits both US business cards (88.9 x 50.8 mm) and EU/ISO cards (85 x 55 mm), in stacks up to about 25 mm deep. The front has a thumb notch so you can pull out one card at a time, and a closed-end 12 mm pen trough keeps a pen from rolling off. The whole part measures 100 x 66 x 42 mm and needs no supports.