Leecraft - CR-1 Zero Clearance Insert (Rating: 5)

A won't go too in-deepth here. Its a pretty simple product and it works well. The insert has 4 leveling screws to adjust flush with the table top. It also has adjustable screws in the top/side to prevent any lateral movement (see pic). The insert actually fit pretty well out of the box. After about 2 minutes worth of adjustments, it was dead-on. Seems to be good quality and I have no reason to think it won't last for years. I'll probably buy two more for dado and thicker, crosscut blade kerfs.