It is used for the travel limit of the power feed ，and automatically stop feeding after collision.
There are three lines， four lines，two types
Suit for most power feed machine
Package：1*Mill Switch
We provide 90 days return service，any question please contact me
Shipping Instruction:
1 We ship to worldwide .
2 Make sure your Address is correct. A phone number is recommended for a more accurate delivery.
3 Orders will ship within 3 business days after payment has cleared.
4 We try our best to provide you the most reliable, affordable way of shipping service.
But sometimes international delivery is highly depended on the local customs and post service.
If you do not receive your item on time, please contact us immediately for further assistance.
We will be responsible for any damages or losses incurred in the shipping process.