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The ACDelco ARI12186-3T is a 12V brushless 3/8-inch impact wrench sold as a bare tool. It delivers 140 ft-lbs of torque in a body just 5 inches long, with four digital modes including Auto Stop and Speed Down. It suits mechanics and DIYers who need compact power for engine bays and tight spaces. Compared with 18V/20V impact wrenches, it is smaller and lighter but has less torque, so it is best for light to medium fastening rather than heavy suspension work.
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The ACDelco G12 Series ARI12186-3T is a 12V brushless impact wrench with a 3/8-inch square drive. It delivers 140 ft-lbs of torque in a lightweight, compact body about 5 inches long, so it fits in tight spaces such as engine compartments, wheel wells and interior assemblies.
Its brushless (BLDC) motor has no carbon brushes to replace. It provides up to 70% more power and longer runtime than traditional brushed motors, and it runs cooler.
The wrench has four digital speed settings, including High and Low speed. Auto Stop mode detects resistance and stops to prevent over-tightening. Speed Down mode slows the tool as a fastener loosens, which keeps nuts from flying off. It is sold as a bare tool.
