I'm working on a big home renovation project and need to remove a lot of head nails buried in the wood. This nail puller exceeded all my expectations. When the nail head is flush with or below the wood surface, I can drive each end of the sharpened tip of the puller into the wood to avoid the nail, grab the nail head, and pull the nail out. If the nail is less than 5 cm long, I can pull out the whole nail. Otherwise the head of the nail is high enough above the board that I can hook it with a regular pry bar. Buying this nail puller was a smart investment.