Features: brand new and high quality ● Material: plastic + stainless steel wear-resistant and corrosion-resistant ● The washer prevents the nut from loosening. Mainly used for machines with vibration loads. ● Comes with a plastic box for easy storage ● 450 pieces/set of aluminum rings can be used for a long for time ● Easy to install, suitable for frequently disassembled parts Specifications: Material:Metal Color ：Silver Size1: Approx.6x10x1.0mm/0.23x0.39x0.039inch - 40 stuks Size2: Approx.6x12x1.0mm /0.23x0.47x0.039inch- 40 stuks Size3: Approx.8x12x1.0mm/0.31x0.47x.039inch - 40 stuks Size4: Approx.8x14x1.0mm /0.31x0.55x.039inch- 40 stuks Size5: Approx.10x14x1.0mm/0.39x0.55x 039inch- 40 stuks Size6: Approx.10x16x10mm/0.39x0.62x x0.39inch- 40 stuks Size7: Approx.12x16x1.5mm /0.47x0.62x0.059inch- 20 stuks Size8: Approx.12x18x1.5mm/ 0.47x0.70x0.059inch -20 stuks Size9: Approx.14x18x1.5mm/ 0.55x0.70 x0.059inch -20 stuks Size10: Approx.14x20x1.5mm/ 0.55x 0.78x 0.059inch-20 stuks Size11: Approx.16x20x1.5mm/ 0.62x0.78x0.059inch20 stuks Size12: Approx.16x22x1.5mm/ 0.62x 0.86x0.059inch-20 stuks Size13: Approx.18x22x1.5mm/0.70x0.86x0.059inch -20 stuks Size14: Approx.18x24x1.5mm/0.70x 0.94x0.059inch-20 stuks Size15: Approx 20x26x1.5mm/0.78x1.02x0.059inch-20 stuks Size16: Approx.22x27x1.5mm /0.86x1.06x 0.059inch- 10 stuks Size17: Approx.22x29x1.5mm/ 0.86x 1.14x0.059inch- 10 stuks Size18: Approx.24x29x2.0mm / 0.94x 1.14x0.078inch- 10 stuks Package Includes: 450pcsxSealing Ring note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.