... motor 5. Metal Body for heavy duty work Rotary hammers are similar in that they also pound ... a much more powerful hammer blow. One can drill bigger holes much faster. Rotary hammers have such force ... require special bits which can lock into the rotary hammer and continue on spinning while smashing away.A ... are: SDS, SDS-MAX, and SPLINE SHANK.Rotary hammer drills have an oil filled gearbox, which allows ...