Phase Blocks for 1-1/4"(31.75mm), 3/4"(19.05mm).

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Will take screws: 10-24nc or M5. Holes are near size but will need drill chasing and tap.

 

Recommend print with PET. 50% Infill seems to work well. Not meant to hold work for miter cuts. But if you're daring, maybe 100% infill can hold work?

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Pithy Bikes Phase Blocks are free for use but not for re-sale.