This item are made of zinc alloy material for durable and long lasting use. It is suitable for 6mm hole diameter gas stove use. It is great tool which can provide help in stove switch replacement. Caution: Please confirm your stove are fit with positive knob before purchase. Features - Color: Silver- Material: Zinc Alloy.- Size: About 4 x 4 x 2.5 cm.- Made of zinc alloy material, the knob is durable and long lasting use.- It is suitable for gas stove switchreplacment.- and high quality, durable in use.- Universal: fit for all 6mm hole diameter gas stove.- Caution: This is an positive knob, please confirm before purchase.- Warm Tip: Dear buyer, Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand Thank you Packing list: 6 x Knobs