... for power tools. 1.small spark,low noise 2.long use life,safety HITCACHI carbon brush,HITACHI 99 ... No.99-012For ModelCLH,NU,2,3,4,NLU,2,NUS-SR,2,3,NUP-SR,NUP,2,NUN,2power tools carbon brush ... never appears scratch, rough, ablation and so on. (2) With a good flow properties and set to change ... original manufacturer's specification. Any more than a 2 degree variation in the setting can cause arcing, ...