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Milwaukee 4090 Diamond Coring Motor The Milwaukee 4090 is a Diamond Coring Motor - 375 750 RPM 20 AMP w Shear Pin. Diamond coring motors are used w Vac - U - Rig® and Dymorig diamond core rigs to drill holes into reinforced con - Home/Family - Home Improvement 487650266 Milwaukee 4090 Diamond Coring Motor crete. This 15 amp model provides core drilling power where 20 amp service is unavailable. This unit has a 375 rpm or 750 rpm operating speed. The 4090 uses a shear pin to protect gears and motor against overload. Shear pins are replaced and pins are included w the unit. This unit will handle core bits from 2 - 1 2 in. to 8 in. in diameter. Features 2 speeds 375 and 750 rpm 15 amp motor Shear pin protection protects gears and motor Built - in water swivel What's In the Box Milwaukee 4090 Diamond Coring Motor Built - In Water Swivel Water Hose Adapter Water Control Valve Open End Wrench 6 Extra Shear Pins |