A jigsaw cuts using a rapid up-and-down motion. They work well cutting shapes and curves and may work with woods of varying thickness and density. The Bosch jig saw GST18V-47N features an ergonomic and well-balanced barrel-grip design. This powerful 18V tool provides variable-speed control. It uses a dial to control the operating speed, delivering from 550 up to 2,700 no-load strokes per minute.