This is 810 to 510 drip tip adapter.
You could use 510 drip tip on Smok TFV12, TFV8 atomizer by installing this adapter.
Package includes 2pcs drip tip adapter
Shipping time: the same/next day in Shanghai
2 to 3 days to other cities in China
around 10 to 20 days to most countries world wide
Payment method: Paypal or Credit Card through Paypal Option
Paymet on delivery in China
WeChat or Alipay in China