Using your OX Pro 4.5 - inch Sandwich Tuck Point Blade is easy. First, make sure you're using it with an angle grinder as it's designed for. When doing tuck - pointing, masonry, or concrete work, just attach the blade to the grinder and start removing the motor joints. It'll cut fast thanks to the turbo segment. The 12mm segment ensures it lasts a long time. As for the 90 - day no - hassle guarantee, if you face any issues, you're covered. Remember, always wear proper safety gear like goggles and gloves. After use, clean the blade with a soft brush to keep it in good shape. Store it in a dry place to prevent rust and damage.