... is only limited by bearing life1.3, Efficiency: brushless motors with high efficiency, long time not too hot1.4, Low noise ... holds no fatigueThe advantages of the non-carbon brush compared with traditional electric batch brushless dc2.1 Good heat output, strong ... , Winding cup: enamelled wire is cylindrical shape, enameled wire slot with higher rate Brand new TGK-BL108 full-auto Electric Screwdriver