These sliding blocks are a quality product. The 1/4-20 threads are clean cut and the dimensions of each part are the same. I used it to make a carved board for my Shapeoko XL and it works great. I noticed that I was given fewer than 100 packs and there were several 3/16 packs in the bag. I would recommend that you factor this into your design if you need anything close to 100.
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