I had a bit in this set that had a shank that was too small, causing it to slip and damage the wood. I called and they immediately sent a replacement and took my credit card until I sent the defective one back. Despite the defect that occurs with every manufacturer, I still give Whiteside 5 stars for solving the problem. I only buy Whiteside bits because they are the most popular, best value, and MADE IN THE USA! When I reported the issue the gentleman I spoke to said he would check all stock for that particular part number. When you purchase this set please measure the diameter of the shank, this was 0.002 inch smaller.