Shipping was quick and everything comes in its own plastic carrying tube. All materials and crowns appear to be of high quality, well finished and well welded. I used the largest bit in this set and it cut through 12" CMU webbing very easily with no visible bit wear. I discovered this problem early enough when I was having moderate difficulty removing the bit extension. If I hadn't noticed this problem in time, I would never have been able to remove the shank extension from the drill. This is why other manufacturers may have turned to the MAX shank size for larger bits. I would have been upset if I hadn't found this in time, but I didn't want to buy or rent a MAX stock. It worked well and I was able to finish the job with sharp and clean penetration. I might be able to use an extension when I fix the warp. But for $39.99 I'm very happy that this hole is drilled clean and I may have a spare kit for smaller projects. 12/25/20 - I contacted the seller and seller quickly and professionally and fortunately resolved the issue. Definitely recommend doing business with this seller. I am very satisfied with the sale, the product and the seller. Thank you for reading my review.