Hilti 03482658 SIW 18-A 1/2-Inch 18-volt CPC Cordless Impact Wrench with Resistant Case and 1/2-Inch Square Chuck - Power Milling Machines - Amazon.com
Hilti 22-Volt Lithium-Ion Cordless 1/2 in. Impact Wrench SIW 22T Tool Body 2149753 - The Home Depot