The Matco Tools 18V 3/8" Cordless Impact Kit, No. MCL1838IWK, includes an MCL1838IW 18V 3/8" impact wrench, MCL1840LB 4.0Ah 18V Li-ion battery, and MCL1840CHRG 14.4V/18V battery charger (slide type batteries) all within convenient, rugged case. The Matco MCL1838IW is designed for productivity with a longer run-time, more efficient lithium-ion battery, and impressive torque output. This impact features a variable speed trigger, LED activated light and replaceable carbon brushes for a prolonged motor life. Matco’s 4.0 Ah battery delivers 33 percent longer runtime over 3.0 Ah batteries, says the company. The MCL1838IW 3/8" impact includes a new 18V motor that generates up to 230 ft/lbs of working torque and 325 ft/lbs of breakaway torque. A heavy duty clutch mechanism provides high output reversing torque.