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Product Description Coring Rig Dymodrill, Motor HP 4.8, Amps @ 120V 20.0, No Load RPM 450/900, Core Bit Cap Concrete (In.) 10, Tool Weight (Lb.) 24, Two Speeds, 450 And 900 Rpm, 20 Amp Motor, Shear Pin Protection Protects Gears And Motor, Built-in Water Swivel, Includes Built-in Water Swivel, Water Hose Adapter, Water Control Valve, Open End Wrench, Six Extra Shear Pins From the Manufacturer Diamond coring motors are used with Vac-U-Rig and Dymorig diamond core rigs to drill holes into reinforced concrete. This 20 amp model features 4.8 peak horsepower with a 450 rpm or 900 rpm operating speed. The 4094 uses a shear pin to protect gears and motor against overload. Shear pins are easily replaced and extra pins are included with the unit. This unit will handle core bits from 2 in. to 10 in. in diameter.