【4 Essential Sizes + Extension】 Includes 17mm, 19mm, 21mm, 22mm flip sockets AND a 3" 1/2"-drive extension bar. Covers over 90% of sedans, SUVs and light trucks - no more tool mismatches. 【Universal Compatibility】 Works flawlessly with 1/2" drive impact wrenches, ratchets, or breaker bars (manual/power tools).