Rubber washers for plumbing applications and for use as buffers and packers. Wide range of uses in the home and workplace. Includes (Inner Dia x Outer Dia x Width) : 10 x rubber washer 14.5mm x 24.5mm x 2mm; 20 x rubber washer 11.5mm x 23.5mm x 2mm; 20 x rubber washer 10mm x 19mm x 1.8mm; 30 x rubber washer 6mm x 14mm x 1mm; 40 x rubber washer 5mm x 10mm x 1mm. Handy storage case with compartments.