Dewalt DWE7491 Table Saw Miter Track Bar for jig construction
These bars fit my DWE7491 miter tracks precisely so they have as little clearance as necessary to slide easily. May work on other types of table saws or you may have to sand them a little if they are too tight for your saw.
Used for building all sorts of table saw jigs. The 12mm versions works when you want to cut a dado in your jig to accept the bar. The 10mm versions work for flush mount. Hole spacing is 100mm(3.937") for the 260mm size and 70mm(2.756") for the 180mm size. The holes are sized to precisely fit a M6 button head socket cap screw. If you are using 1/4" screws you'll have to drill the holes larger.
The 260mm version is just about the longest I can print diagonally on my Prusa MK3S+ printer. I included a shorter 180mm version for smaller jigs.