SAFE FOR ALL WIRELESS, ELECTRIC AND PNEUMATIC KEYS: Maximize your productivity with our universally compatible impact wrench extension bars, available in 3 sizes 3 inches, 5 inches and 10 inches long. MADE TO WITHSTAND THE TOUGHEST SITUATIONS: construction Hardened and heat-treated chrome-vanadium alloy steel and manganese phosphate coating ensure maximum durability. KEEP THE KIT IN YOUR TOOL BOX: We have added practical storage that prevents you from losing your extension bars in your cabinet.