I wanted to drill pre-machined 6x6 pins. This bit went through the material with no problems. I've used it over 25 times in a row and not once has it faded. I also like the carrying case to store the racquet in and it is locked. They come with a plastic cap on the end of the large one to protect the threaded portion of the bit entry. I just wanted to buy a longer racquet to go all the way through two 6x6 posts, but that's my fault. The beat went on as long as it could without slowing down.