Husqvarna Diamond Core Drill Bit B30 2 Inch Vari Drill 592881001 (Laser Welded Segments 2 5 Height Wet Drilling Concrete Masonry Hole Coring) Fasteners HVAC Ducting & Timber Header HVAC Ducting & Timber Header Boring: Executing multi material circular cuts through sheet metal ductwork and dense nail embedded wood framing in a single pass Electronic Self Leveling System: Fast acting electronic leveling motors automatically compensate for up to 5 degrees of slope with 1 16 inch accuracy at 100 feet fast penetration rates 4 inch tall diamond infused segments ensure prolonged cutting life and consistent wear rates in abrasive materials