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Arduino Uno Keyhole Bumper Tray
A screw-down tray for the Arduino Uno R3/R4 footprint (68.6 x 53.3 mm board) with four 7 mm standoffs on the factory hole pattern, 2.6 mm self-tap bores for M3 screws, a 12 mm bumper rim on three sides and the USB/jack end left open. Two #8 keyholes 30 mm apart hang it on a wall or screw it flat, and a 19 mm cable-tie apron with four 3.5 mm slots strain-relieves the USB and barrel cords.
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