Hitachi WH10DFL2 12V Peak Cordless Lithium-Ion Impact Driver Kit Powered by Lithium Ion battery technology for fade-free power and lighter weight than traditional nicd batteries 955 in/lbs of driving torque for heavy applications like tightening carriage bolts, driving Lags and sinking deck screws Impressively lightweight at only 2.2 lbs and compact at less than 6" in length 12 Volt Peak Cordless Lithium-Ion Impact Driver Kit (Certified Refurbished)