Carbon seal ring, carbon plate, graphite bearig anti-jamming is good durable steady-running carbon seal ring,plate,griphite bearingfeature:durable ... is good steady-ruuning anti-elecromagnetic interferencebrand:BOSCH,DeWELT,MAKITA,FLEX,KRESS etc.measure:7*10.5*17/6.3*8*13/6.35 ...