Bosch Pro 2608601412 Diamond Dry Core Drill 142mm Dia x 400mm Long (INC VAT). Size: Diameter = 142mm Length = 400mm. The Best for Universal diamond dry core bit offers a long service life when dry drilling in masonry. The segments are laser-welded. The roof segments of the core bits enable quick centering and easy drilling. Designed for dry drilling in masonry for junction boxes, sockets, plumbing pipes etc. This core bit is designed for building materials such as limestone, brick and masonry. Diamond core cutter for dry drilling G 1 1/4 UNC Best for Universal 142 x 400 x 11.5 mm, 6 segments. Long service life in masonry. The Best for Universal drilling crown for dry drilling offers long service life when drilling in masonry. Segments are laser-welded to ensure high durability. We offer a fast next day courier service to Mainland UK. (other destinations may vary). If you are happy with our service please provide feedback.