4-inch Wet Drilling: Our lightweight handheld core drilling machine can perform wet drilling, and you can feel assured of accuracy when boring holes in a variety of surfaces with a 3.1-4 in / 8-10.2 cm diameter hole capacity. More importantly, a industrial-grade 4in core bit with 1-1/4' thread is thoughtfully included. Two Gear Speed: Our 2-speed electric core drill, 1100RPM / 2400RPM, has a convenient gearbox allowing different speeds to match the type of material being drilled and helping control the ideal speed for the job. 1500W strong motor to ensure the machine drilling fierce and consistent work. Effortless Drilling: Our handheld drilling rig has a rustproof steel forged output shaft to bear more pressure, an upgraded one-touch water pipe connector for a stable water supply, and a shoulder rest for you to easily carry the core drill rig on your shoulder and reduce friction caused by drilling