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Home Depot [homedepot.com] has M18 FUEL 18-Volt Lithium-Ion Brushless Cordless Mid Torque 1/2 in. Impact Wrench W/ Friction Ring (Tool-Only) for $ 129 with Free Shipping or Ship to Store.

Compact length at 6.7 in. to allow for more access in tight space
Lightweight tool at 5.3 lbs. with XC5.0AH battery for less fatigue
Delivers up to 450 ft. lbs. of fastening torque