Hello isao, this is Colin from Simpson Strong-Tie. We appreciate your feedback and are very sorry your experience with our E-Z Mender was less than ideal (an understatement I realize). I understand the difficulty you had installing the product. We have designed the EZ Mender with 12 gauge steel that can be driven into reinforced deteriorated posts set in concrete or soil in most cases. The force required to drive them can vary depending on the soil condition, concrete strength, and the wood post condition (how tightly the wood post fits in the existing concrete). Please feel free to reach out to our Customer Service Team at 800-999-5099 if you have any other questions.