Everything You Need for Precise Core Drilling - All in One Pack. The 78mm Core Drill Block Starter Pack has been carefully assembled to provide contractors with everything required for fast, accurate, and efficient core drilling installations. No need to source individual components, simply open the pack and get to work. Each pack includes: 1 × Core Drill Block 1 × 10mm SDS Plus Drill Bit 1 × 17mm Socket 2 × Heavy-Duty Screw Bolts Using the supplied 10mm SDS Plus drill bit, simply drill the pilot hole, secure the Core Drill Block with one of the included screw bolts using the 17mm socket, and you're ready to drill. The Core Drill Block provides a precise guide for your core drill, helping you achieve accurate, repeatable holes while saving time. A second screw bolt is included as a spare. Whether you're drilling a single penetration or tackling multiple core holes on site, the Core Drill Block Starter Pack is a convenient, all-in-one solution designed to make every job quicker, safer, easier, and more accurate.