Simple designed can improve the efficiency of processing thread, a necessary tool for hand tapping operation. With this tap and wrench set, the thread processing will become more easily and precisely. Perfect for auto repair and machinery where metric threads are specified. Allows you to remove bronken screws or bolts. Specification: Wrench Length: Approx. 19.5cm/7.68inch Main points of operation: 1. The pit and hole must be chamfered first 2. To use the screw thread tap correctly matching with drill clamp 3. Keep vertical alignment operation 4. Horizontally cutting into the wrench and rotating for 2-3 times 5. To confirm whether it is vertical after cutting 6. Tapping 3/4 turn and a quarter turn back 7. Horizontally and reversally pull out after finishing tapping 8. Remember that cutting metal needs to use the oil colour: silver Material: steel Package Contents: 1 x M4x0.7 thread tap 1 x M5x0.8 thread tap 1 x M6x1.0 thread tap 1 x M8x1.25 thread tap 1 x M10x1.5 thread tap 1 x M12x1.75 hand screw thread tap 1 x adjustable tap wrench Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.