Bosch Concrete Drilling Shroud HDC250 SDSmax Core Bit Dust Collection Attachment (1 1 2 to 6 Inch Diameters Dual Air Chambers Universal Vacuum Mount) Screwdriver Bits this electronic self leveling instrument features this electronic self leveling instrument features an automated disturbance monitor that alerts operators to accidental tripod bumps and prevents costly elevation errors and blade binding issues when sizing heavy non ferrous alloys and complicated tool specific clipping constraints by decoupling entirely from the rotary hammer and attaching dynamically to structural surfaces Adaptable Coring Footprint: Optimized to process standard 1 1 2 inch to 5 inch bits natively