So, there is a quick release SDS-Plus tool-holder and key-less chuck supplied. As a result, for easy switching between hammer / rotary hammer and rotary only applications. DCH334N-GB Hammer Drill is a category-leading high speed drilling performance at more than 66 holes (18mm x 80mm) per charge. Rotation stop mode for light chiselling in plaster tiles and render and impact stop mode for rotary only drilling in wood and metal.