Model QL15N-MH, adjustable from 3N·m to 15N·m. The head is 1/4 inch. This is the perfect size for tightening small screws on bicycles, engines, and the like. The adjustment dial spins freely, and torque adjustment is not possible. Also, there is no clicking sound or vibration when tightening, so this is a junk item. Please purchase with the assumption that calibration or repair will be necessary. Thank you for viewing.