1The adapter is specially designed for our milk bottle warmer. 2With the adapter, you can use different brands milk bottle with the warmer conveniently. 3High-quality material, durable and BPA-free, safe and reliable. 4Easy to install, no need any tools. 5Please check the milk bottle brands before ordering the adapter in different size. Features: The adapter is specially designed for our milk bottle warmer. With the adapter, you can use different brands milk bottle with the warmer conveniently. High-quality material, durable and BPA-free, safe and reliable. Easy to install, no need any tools. Please check the milk bottle brands before ordering the adapter in different size. Specifications: Size: 35mm/50mm/53mm/56mm/60mm/65mm(optional) Packing List: 1 * Adapter 1 * Adapter