Our Dry Hole Saw bits are the best in the business. We were the first to introduce them and nobody sells more. Drill dry through block and brick in seconds. No water needed. All bits have 5/8in.-11 threaded hubs. Dry bits have 9in. drilling depth. Jacobs Chuck Adaptor available for hammer drills 5/8in.-11 thread to straight shank. SPECIFICATION DH - Block and soft brick. Notes: Not all types of brick and block can be drilled. Please consult factory. Not suitable for concrete or hard materials.