Fit is dead on in my Dewalt DW754. No problem making a zero-clearance slot and leveling it. For the DW745, which the manufacturer says it is NOT for (no doubt for some lawyer), one must continue the kerf all the way through the back of the insert to accommodate the riving knife. Works perfect with the riving knife. I can't remember how I continued through to the backjig-saw? Feeding insert to saw? Dunno. Must be Alzheimer's. You're a big boy/girl, you'll figure it out.