Box contents: 100 pieces copper rings 18 x 24 x 1.5 mm, tolerance +/- 0.2 DIN 7603 form A. Areas of application: engine area (truck/car), HD injection pumps, oil drain screws, hydraulic components, filling devices, fittings, truck pumps, gravity machine, electrical engineering. The sealing rings are soft annealed (max. 45 HB) and can therefore be easily deformed during installation. This ensures that an optimal sealing effect is created.