Bosch 11335K 35-Pound 1-1/8-Inch Jack Hammer Kit Unmatched power to weight ration; 34-feet-per-pound of impact force; faster removal rate in its class by far Active vibration control handle--a unique flexible 2 -handed design that reduces vibration by 40-percent over the closest competitor Versatile bit retention--accepts Bosch 1-1/8-inch hex steel as well as standard 1-1/8-inch air steel Total comfort and control--articulating auxiliary handle to maintain the best working posture possible Rugged durability--metal tube and case design handles tough jobsite use and abuse