I ordered the following item from Revain on June 6th, 2019 and received it on June 8th. Tool Articulated Self-Centering Woodworking Bits, Adjustable Window & Door Bits with 1 Hex Key and 8 Replacement Bits (5/64" - 1/4"), 16pcs. They appear to be well made and of good quality. It's something I don't use every day, but when I need to place a hole correctly I use this. After two days it was time to try them out. When I removed the 5/64" bit, the drill bit fell out. I put it back in, took the supplied hex wrench and tightened the set screw. The set screw wouldn't budge and was actually twisting the hex wrench. I emailed to tool customer service whose address was on the thank you card that came with the product.I was just describing my problem and hoping for a reply.When I opened my email the next morning I was waiting for a reply.Here is what I got... Hi Jim, Have a nice day! Thank you for shopping in our store. We are very sorry to hear that the product you received is defective and would like to offer you a replacement send new product or issue a full refund with no return.We are constantly improving our products and services.Meanwhile, we also invite you to post your purchase information so that others may be aware of yours experience can benefit. As a growing company, we know how daunting time can be, so we value your time and contribution. I am sincerely sorry for the inconvenience caused to you. Please let me know what you think. Looking forward to hearing from you soon. Sincerely, Werkzeug VIP customer service What more could you ask for? I am very satisfied with your product and also with the quick and courteous response. I expect my replacement part to arrive any day.