I have owned this set of bits for a long time and I am very pleased with their quality. The bits stay sharp for a good long while and the assortment includes all of the sizes you would use most often. This new design for the case is a vast improvement and it seems to hold up well. I keep my bits right in the case with my DeWalt cordless drill so I am never without them!Buy these and you won't regret it - especially if you often work away from your workshop!