QISF Adjustable Silver T-Handle Ratchet Tap Holder Wrench with 5pcs M3-m8 3mm-8mm Machine Screw Thread Metric Plug T-shaped Tap

The good pit hole must chamfering chamfer first 2. To use drill clamp supporting tap 3. Tap to ertical alignment operation 4. Cut into rotation leel 2-3 times 5. confirm ertical after Cut 6. Tapping 3/4 turn after a quarter back feeling 7. leel reersal pull out after working 8. Remember that cutting metal need to use with the oil Package Included: 1 x T-Handle Ratchet Tap Wrench 5 x Hand Screw Tap.