Makita 415209-5 Plastic Insert Kerf Board Plate
The Makita kerf board is located on the base of the below cordless mitre saws, this part can become damaged as the saw blade is in constant contact with the saw blade, as such, it can sometimes break and when cleaning the machine it can be lost, the part is sold in singles so you may need to order two to cover both sides.
This will fit all models listed below