Really useful both in the workshop and in the paddocks this little case contains 245 copper gaskets with varying sizes : from 4 to 18 mm diameters with different thicknesses. To help you cover all eventualities ! Size indications : mounting diameter x internal diameter x external diameter (mm) 50 gaskets : 4 x 8 x 1 mm 50 gaskets : 5 x 8 x 1 mm 30 gaskets : 6 x 10 x 1 mm 20 gaskets : 8 x 12 x 1 mm 20 gaskets : 10 x 14 x 1 mm 15 gaskets : 12 x 16 x 1 mm 15 gaskets : 13 x 18 x 1 mm 15 gaskets : 14 x 18 x 1 mm 15 gaskets : 16 x 55 x 1 mm 15 gaskets : 18 x 24 x 1 mm