The Boss diamond core drill is manufactured from the highest quality using German engineering standards and components. The Boss cuts core holes at a maximum drilling diameter of 152 mm through bricks, concrete blocks and much more consistently delivers high hole cutting performances with safety constantly in mind. The unique quick release adaptor on the end of the core drill allows fast interchangeable core bits without the need for tools when used with Clipacore core adaptors. The quick-release extension bar supplied with every core drill ensures most wall depths can be fully penetrated with ease. Drill, extension bar and drill adaptor only, no cores included. An excellent core drill for professional plumbers, electricians, & general contractors that comes with a one-year manufacturers warranty.