Just pull the top handle, rotate the marked barrel to the desired bit and push the handle back down and your ready to work. Non-slip soft grip handle for comfort gripMade of ABS plastic for durabilityForward/reverse knob18 teeth high torque ratchetMagnetized ¼" bit holderIncludes:#1, #2, #3 Phillips bits4, 6mm slotted bitsS1, S2 square bits50mm extension bar