I received this kit in exchange for my honest opinion of the Vine program. This is a complete kit that complements the larger bits I already have and now expands the capabilities of my drill press. There are nine nozzles included, some of which (the most common sizes like 1/4" and 5/16") are duplicated, which I think is a great idea. At this point I had the opportunity to drill about a half dozen 5/16" holes in the poured concrete slab for some of the joists I was installing, but the drill bit made the holes quickly so I suspect other sizes only will work. The manufacturer also claims that the drills are made of high quality carbon steel with carbide tips, although I cannot confirm the accuracy of this statement, I can say that the drill drilled quickly and I did not notice any dullness the first time. The hole is to the very end so I suspect the statement is true. For the price I would say these bits are very good value and a great addition if you have an SDS shank drill.