RMT 009 Rotary Drill - Rotary Hammers for Chipping, Scarifying, Scaling, and Cleaning Welds These rotary hammers are used in a wide variety of constructions and maintenance applications. Few examples are driving or setting masonry anchors and drilling holes in concrete, bricks, or rock. Like a hammer, these tools can also be used for chipping, scarifying, scaling, and cleaning welds.