Hammer drills produce less pounding force than rotary, demolition, and breaker hammers. Rotary hammers use high-impact, low-frequency blows to drill and chisel holes in concrete and masonry. They have a hammer-and-rotate mode that spins and thrusts the bit to drill larger-diameter holes in harder materials than hammer drills. They are also known as SDS drills and combo hammers. For light demolition, their hammer-only mode chisels and chips. Demolition and breaker hammers use a chisel to chip, break, cut, and scrape concrete, masonry, brick, asphalt, and tile with a high-impact chisel. They're chiseling instruments with a hammering action for operations that require more impact energy than rotary hammers.