Rotary drills are heavy duty machines meant to drill holes in tougher material such as concrete and masonry. These drills are multi-functional and find application in a variety of jobs. Corded rotary drills are powered by electricity whereas the cordless ones derive their power from Lithium-Ion batteries. Cordless drills offer better manoeuvrability and you do not have to depend upon a power source to complete your job. Cordless drills are priced higher as compared to corded ones. Electric rotary drills are powerful and you can execute heavy duty tasks easily. Rotary drills can work on a wide variety of surfaces like aluminium, metal, plastic and hard plastic. These drills offer the flexibility to control the drilling speed depending upon the job requirements. Some rotary drills have a reversible feature to facilitate screw driving. Due to their compact ergonomic designs, these rotary drills are easy to use and can be carried around easily.