The top brand set from BOSCH in a case with 2 small carbide tipped drill bits with 1/4" hex bits so I can drive in special concrete/masonry screws (page 3 my blue screws). Sometimes I need to drive a screw into masonry or concrete a bit without an anchor. This requires a specific hole size and the use of special screws.This kit allows you to do this although it is limited to only two sizes of carbide drill bits.I appreciated the good info on the back of the packaging and actually cut it out and added it to the kit in the case The listing is for specific bits in this small set This is excellent Bosch quality but the value is limited t, since hex bits are nothing special and lack the extra sizes of carbide drills. This lowers half of the star, but as there are no halves I use 5 by default. I recommend this 9 piece BOSCH TC900 flat shank drill bit set. It's convenient to have everything in one set, but it's not very profitable. I hope you found the information and my review helpful.