A set of spare brushes for when the ones one your milling motor have worn out. The AMB (Kress) brushes have an automatic shut off function to prevent damage to the motor when brushes are worn. If your motor stops running, it is very likely the brushes are worn.
Spare brushes for the AMB (Kress) 800 FME, 800 FME-Q, 1050 FME-1 and 1050 FME-P
Red wired brush is the brush with auto shut off
Anti-vibrating silicon stripe for longer life