... brush for power tools. 1.small spark,low noise 2.long use life,safety HITCACHI carbon brush,HITACHI 99 ... No.99-011For ModelC-16,F-20,F-20A,HUS,2,3,4,5,HUS-ORN,2,3,HC-3,KS-4 ... never appears scratch, rough, ablation and so on. (2) With a good flow properties and set to change commutation ... the original manufacturer's specification. Any more than a 2 degree variation in the setting can cause arcing, bar ...