Milwaukee 2659-20 M18 1/2" Impact Wrench with Pin Detent. The M18 1/2" Impact Wrench is loaded with 2200 in-lbs of torque for drilling, driving, and durability. This compact driver is small enough to fit in tight spaces, and fix problems in areas where space is limited. The Milwaukee M18 1/2" Impact Wrench works with a REDLITHIUM battery designed to deliver more work per charge, and a 4-pole frameless motor. The M18 also features a built in LED light, battery gauge, and a light weight frame.