Comes with 18 different sizes, so that meets your different needs in the work. Made of high quality aluminium ensures the . perfect for replacing your old or broken aluminium gaskets. Comes with a small box, perfect to sort the different sealing rings. and high quality. This set of aluminium washers are made of top quality material. They have good electrical conductivity and thermal conductivity. Comes in a nice case and are in individual comparments by size. Insert paper has actual sizes so it is visible when case is open corresponding to each compartment making it easy to identify the washer size you need. Model Number:flat washer name:Sealing Rings Specifications: 6mmx 10mmx 1.0mm 40 6mmx12 1.0mm 40 8mmx12 1.0mm 40 8mmx14 1.0mm 40 10mmx14mmx1.0mm 40 10mmx16mmx1.0mm 40 12mmx16mmx1.5mm 20 12mmx18mmx1.5mm 20 14mmx18mmx1.5mm 20 14mmx20mmx1.5mm 20 16mmx20mmx1.5mm 20 16mmx22mmx1.5mm 20 18mmx22mmx1.5mm 20 18mmx24mmx1.5mm 20 20mmx26mmx1.5mm 20 22mmx27mmx1.5mm 10 22mmx29mmx1.5mm 10 24mmx29mmx2.0mm 10 Colour:Silver Material:aluminium Package Contents: 1 set * Seal washer assembly Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.