The Grey Pneumatic GRY-4120M 1" DR X 20MM STANDARD is a high-quality, 1" diameter round hole drilling machine that is perfect for drilling small to medium-sized holes in a variety of materials. This machine is equipped with a 20mm diameter drill bit and a 1" diameter drilling stroke, making it perfect for drilling into hard materials such as wood, plastic, and metal. The Grey Pneumatic GRY-4120M 1" DR X 20MM STANDARD is also equipped with a built-in speed control system that allows you to adjust the speed of the machine to ensure that you are drilling at the correct speed for the material that you are working with.