Volts: 120, Max. HP: 2.5, Amps: 15, Speed - No Load (RPM): 375 / 750, Motor Protection: Shear Pin, Spindle Size (in.): 1 1/4 - 7, Suggested Diameter in Medium Aggreate (in.): 5 - 8 (375) / 2 1/2 - 5 (750), Tool Weight (lbs.): 26 For with Vac-U-Rig and Dymorig diamond core rigs to drill holes into reinforced concrete Handles core bits from 2 1/2in. to 8in. in diameter Built-in water swivel Includes adapter to receive standard water hose, water control valve, 6 extra hardened shear pins, and wrench Model 4090 U.S.A.