this invention relates to an electric drill with speed and torque control and in particular to one which utilizes a single adjuster ring to control output speed and torque . when the adjuster ring is turned , the transmission axle will engage with another gear thereby changing the output speed . further , in the meantime , the force exerted on the driven gear will be changed to adjust the output torque . the clutch and the driven gear are engaged by means of steel balls received in the recesses thereof .