This movable threshold can control the size of the door open, sometimes just the wall behind the door or something else you want to do. Others are advanced because you can't see you and push the door open. You will be hurt. If you build a door to prevent a door switch from being placed underground, it won't let you be directly affected.
Sample order: 10-15days
Delivery takes 3-10 days.
Bulk Production order: 35-45 days