●[Application]: Compatible with Bosch PKS 40, PST 650, PST 680 E, PST 700 PE, PST 750 PE, PST 800 PEL, PST 900 PEL, PFZ500E. ●DIMENSIONS The size of these carbon brushes is approx. 15 x 8 x 5mm ●[Auto Stop]:With automatic stop function, once the wear of the carbon brush indicates that the carbon brush needs to be replaced, the machine will stop working. ●[Function]: Worn brushes are often the cause of a poorly running engine. Replacing brushes can repair an intermittent motor. ●Durable Material:Made of high quality material, long service life, high strength and durability, ideal replacement for your old or worn part.