Ultimately adjustable. Once you get them dialed in all your rod tips can be - exactly - the same distance off the water, which makes it easier to detect the light winter bites.
Extremely sturdy and well made. You will give these to your grandkids. lol
Also, the way they are set up, you set the hook with a straight up hook set. Much more powerful and fast than the out & up from others.
Good luck out there!