When I bought this, I only needed one item in the packet of 7, but for the price it would be worth it if it worked. When I tried to screw it in using a 3/8 inch ratchet, it would not grip securely enough. The bit size on the portion that goes into the hole should be twice as long, so it grips securely. When I tried to use it with a power drill on low power, it shredded. While it does not cost that much, I would recommend looking for something else to meet your needs for the job at hand. Thus my one hope out of seven went unfulfilled, so I went to the local hardware store and bought the one specific item I needed to finish the job.