Genuine Milwaukee HD18HX Spare Parts.*Please note this is the old style copper switch, Please check you have the right technical drawing* High powered motor gives corded tool performance REDLINK™ overload protection electronics in tool and battery pack deliver best in class system durability Powerful hammer mechanism: delivers 2.4 J (EPTA) of impact energy All metal gear case: optimum seating for gears to enhance service life 4-mode operation: rotary hammer, hammer only, rotation only and variolock for maximum versatility Variolock and hammer stop function FIXTEC™ system - keyless chuck changing Mechanical clutch: protects tool when bit binds up Anti-Vibration-System delivers max. comfort by minimising vibration Individual battery cell monitoring optimises tool run time and ensures long term pack durability Fuel gauge displays remaining charge REDLITHIUM™ battery pack provides superior pack construction, electronics and fade-free performance to deliver more run time and more work over pack life Flexible battery system: works with all MILWAUKEE® M18™ batteries