GearWrench 3468 4 Piece Diesel Compression Test Kit Set Includes a Compression Gauge With Protective Boot and Special Air-Hold Valve for Easy Reset and Three Brass Adapters Brass Adapters are: 24mm X 20 to Test VW, Volvo, Audi, Dodge, Mercedes & Cummings 5.9-L; 10mm X 10 to Test GM 4.3-L 6 Cyl, 4.3-L & 5.7-L 8 Cyl Gauge Checks from 0 to 1000 PSI (0 to 70Kg/Cm2) Features a Quick Disconnect from Gauge to Adapters Kit Comes in a Blow Mold Case