... powder, no pollution, used by clean workshop1.2, Long life: no need to change the carbon brush, life ... life1.3, Efficiency: brushless motors with high efficiency, long time not too hot1.4, Low noise, no carbon ... off to stop using force and the small, long time holds no fatigueThe advantages of the non-carbon ... shape, enameled wire slot with higher rate Brand new TGK-BL108 full-auto Electric Screwdriver