Super compact set of short masonry bits. With them there are no problems when drilling concrete, cinder block and brick. Ideal for anchor or bolt holes. The quality is excellent for home use. I'm not sure if they stand up to commercial/professional use. The hexagonal shank enables use in impact collets or ensures a secure fit in commercially available drill chucks. Great for those little bits. If you are looking for a quality stonemason bit set and don't need excess length, this NordWolf set is a great choice.