Absolutely terrible bit and even worse customer service. I called Whiteside direct and was told they do not guarantee their carbide bits. They wanted me to pay to ship the bit to them to make sure it was "faulty". I used the bit for about 10 minutes before it broke off in my router table with a very shallow pass. $40 for a beat that lasts 10 minutes when the company doesn't endorse their product is absolutely awful. Stay away from Whiteside.