Works when ratchets, wrenches and sockets dont fit.Air hammer powered Shockit Sockets to access, loosen, and remove frozen and obstructed 02 Sensors.Non-slip self centering air hammer angled punch for limited access applications.Removes knock sensors on Kenworth, Cummins, International, Detroit & Volvo diesel truck engines.Includes low profile design for limited access and long profile design for deep recessed Ford, Toyota, and Lexus applications.Dual ear socket design for 90 degree rotation without repositioning socket.18mm dual sided tap