This wrench is specially designed to comply with CESSNA AD 96-12-22. It allows you to reach the adapter nut which must be torqued to a value within 50 to 60 foot pounds in compliance with the AD. Its use is required every time the oil filter is removed to prevent the possible loss of engine oil caused by loose or separated adapters. This tool is absolutely essential for any mechanic who works on any of the following aircraft: All Cessna Model 100, 200, 300, and 400 series; Meyers 200; Twin Commander 500A and 685; Beech 33, 35, 36 and 55 series; Piper PA 46; Navion Rangemaster 17 series; Wren Model 460; Bellanca 200 and 300 series. Works with either 3/8" or 1/2" drive torque wrenches. 1 lbs (0.5Kg) shipping weight.