Makita 267446-5 Washer 5 For RBC351 RBC410 RBC415 RBC421 RBK350 EH490V RBK420G EH450 EH620 MS421

The Makita 267446-5 is a specific Makita spare part, identified as a Washer 5 or Washer M5. 
It is not a complete tool, but a small component used in the assembly of several different Makita outdoor power tools, including: 
Petrol Blowers: RBL250, PB250
Brush Cutters/Line Trimmers: RBK410, RBC230, RBC310, RBC410, RBC420
Hedge Trimmers: EH760