158665 Core Size: 2" Features: -Core Bits MK-Dry Premium.-Premium grade bits for masonry.-Specifically designed to tackle a variety of soft brick and concrete block drilling operations.-They feature laser-welded technology and inventive bar-slot cooling to promote efficiency, reliability and safety.-10" in length, come with standard 5/8"-11 threaded nuts.-Easily attach to most hand-held drills.-Laser welded.-Additional diameters available upon request. Dimensions: -Item # 158661 - Diameter: 1", Min Apms: 6, Max/Min RPM: 6000/2300, Weight: 2 lbs.-Item # 158662 - Diameter: 1-1/4 ", Min Apms: 6, Max/Min RPM: 6000/2300, Weight: 2 lbs.-Item # 158663 - Diameter: 1-1/2", Min Apms: 6, Max/Min RPM: 6000/2300, Weight: 2 lbs.-Item # 158664 - Diameter: 1-3/4", Min Apms: 7, Max/Min RPM: 5000/1600, Weight: 2 lbs.-Item # 158665 - Diameter: 2", Min Apms: 7, Max/Min RPM: 5000/1200, Weight: 4 lbs.-Item # 158666 - Diameter: 2-1/4", Min Apms: 7, Max/Min RPM: 5000/1200, Weight: 4 lbs.-Item # 158667 - Diameter: 2-1/2", Min Apms: 7, Max/Min RPM: 5000/800, Weight: 4 lbs.-Item # 158668 - Diameter: 3", Min Apms: 10, Max/Min RPM: 5000/800, Weight: 4.5 lbs.-Item # 158669 - Diameter: 3-1/2", Min Apms: 10, Max/Min RPM: 5000/700, Weight: 4.5 lbs.-Item # 158670 - Diameter: 4", Min Apms: 10, Max/Min RPM: 5000/700, Weight: 4.75 lbs.-Item # 158671 - Diameter: 4-1/2", Min Apms: 10, Max/Min RPM: 5000/700, Weight: 4.75 lbs.-Item # 158672 - Diameter: 5", Min Apms: 10, Max/Min RPM: 5000/700, Weight: 6 lbs.-Item # 158610 - Diameter: 6", Min Apms: 10, Max/Min RPM: 2500/600, Weight: 8 lbs.-Drilling depth: 9-1/4".