I bought this to remove my catalytic converters on my car as the nuts were slightly rounded and I couldn't remove them with a 15mm socket. I took a chance and bought knowing no 15mm socket was included, it wasn't in the deep hole but the sockets had an octagonal end which I could use a deep socket on, making a bolt would go through. To my surprise, the 16mm nuts from the kit worked fine with my 15mm nuts (probably because the nuts weren't too loose), but I'm sure I could have used the 14mm nuts , if they had really been damaged. This kit was also featured on You Tube on the Project Farm channel where it was praised for its price. I also highly recommend this product!