The Big Red Torin 8-pieces Engine Cylinder Pressure Gauge contains. 1 x spring buckle gauge, 1 x straight rubber cone end adapter, 1 x curved rubber cone end adapter. There are 16 in. L flexible extension hose with 4 sizes (10 mm x 12 mm x 14 mm x 18 mm) selectable brass adapters in the engine compression test kit. The instrument panel with dual cells (0-300 psi, 0-21 kg/sq. cm) makes it easy to read. The acrylic glass instrument cover is equipped with a scratch-resistant coating and a protective rubber cover, giving it excellent vibration damping properties. Includes everything you need for a fast and effective compression pressure testing of petrol, gas, and fuel engine cylinders for most spark plug types on cars, trucks, motorcycles, marines, ATVs, UTVs, snowmobiles, boats, and more. Material: Steel.