Koken 1 2" Dr Attack Driver Knurled Handle 6pc #2 3 Phillips, 9 11mm Flat Gravity Paint Filters 6400M 6pt Socket 3 4"Dr 41mm6400M 6400M 6pt Socket 3 4"Dr 41mm6400M 3 4"Dr Socket 6pt 41 x 62mm 14300M Deep Impact Socket 1 2"Dr 41mm14300M 1 2"Dr Deep Impact Socket 6pt 41 x 85mm AN112A Attack Driver Knurled Handle 6pc 1 2"Dr Includes #2 3 Ph 9 11mm Flat Bits & HolderSpecial heat treatment is applied on the body Hardness of striking part is slightly softer to prevent cracks On the other hand therefore this part is finished with higher hardness to improve anti wear Stronger spring is adapted to convert the striking power efficiently to twisting power