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Designed for an 18mm x 33mm (18x33) form factor which supports the Arduino Pro Mini and Arduino Pro Micro family of boards. Mount with a M2.5 M3 #4 or #6 standard machine screw. Also works with drywall screws, sheet metal screws, or anything else you want to use to mount it. Tie it with some thread! Hook it to your key-chain! It's the all-purpose single-point board mount!