This rotary hammer is able to drill up to 1 1/8-in.-diameter holes or do all-day chiseling making the RH228VC a good choice for the contractor who needs maximum performance in extreme applications. A longer piston and impact bolt, combined with a precision-machined striker, increases the hammer’s efficiency, which in turn increases both speed and power. Bosch Power Tools & Accessories. 877-267-2499.