The Bosch 11264EVS Rotary Hammer packs 6.5 ft. lbs. EPTA of impact energy and features a strong 13 Amp motor for impressive power. With the vibration reduction system in the hammer mechanism, as well as the grip area, you get comfort for extended periods of work. With the hammer's 1-handed, tool-free SDS-MAX system, you can change bits with ease and still achieve maximum job site productivity. Includes SDS-Max and Spline Chiseling Dust Collection Attachment. The HDC300 is a unique dust collection attachment which will fit on all Bosch SDS-max, spline combination rotary and demolition hammers with exception of the 11316EVS SDS-Max Demolition Hammer. The HDC300 is unique in that it allows the user to access the chisel for installation, removal and/or adjustment without removing the attachment. The shroud itself focuses air suction from the vacuum around the chisel for maximum dust collection. The attachment also features a metal extension arm which can be adjusted forwards or backwards to position it correctly around the chisel and to accommodate different chisel lengths. The metal arm also provides added job-site durability. The shroud features a convenient rubber bumper at the tip of the shroud to provide cushion should it contact the work piece during use. The HDC300 comes in a kit that includes an extension tube and 3 adaptors to fit different sized hammers.