Product size length: 12 cm diameter: 21 cm product information the product cap is plastic. the product core is metal. the product is ceiling mounted. the product reaches you ready to use. our delivery time is 1-3 business days. your orders are usually shipped the same day. the products are our own production and are 100% domestic production. more than 100 stocks are offered to be sold at the campaign price. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.