Why two miter slots?

POWERTEC 30 Miter Bar for Table Saw Sled, Miter Slot Runners, Fits 34 x 38 Slot for Crosscut Sled for Table Saw, Taper Jig, Router Table, Band Saw & other

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miter slot bar Follow along with Jay Mowder as he builds a super simple cross-cut sled with the miter bar from

miter slot track on center These holes are for adjustment screws so that the bar can fit the saw miter slot to perfection All of the holes are burr free Package Contains: