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 it’s part of DEWALT’s best performing it’s part of DEWALT’s best performing cordless lineup—perfect for pros who need power this electronic self leveling instrument features an automated disturbance monitor that alerts operators to accidental tripod bumps and prevents costly elevation errors (1) HDC250 SDS max Core Bit Dust Collection Shroud Attachment Specification Value Brand Name Bosch Model Number HDC250 Accessory Type Core Bit Dust Collection Shroud Standard Core Bit Capacity 1 1 2 in