I wouldn't spend so little.

Here's a $65 seat post:



You'll notice there's no saddle on it because the design was bad leading to a broken bolt after just 3415 miles. I had to stuff the saddle in my jersey pocket (wide end first, because it fell out when I tried nose first) and ride home without one.



I replaced the class 10.9 bolts with 12.9 having 20% higher yield and broke the front bolt again after 1693 miles when I weighed 148 pounds.

I told the manufacturer their design was bad and sent it back in case they wanted to investigate, then bought an $85 seat post which uses a male wedge on the post and female wedge on the cradle like a classic Campagnolo part, except brand new and without a vintage price tag.



That one didn't keep the seat tilted like I set it so I made it "really tight" with my regular length 6mm Allen wrench. That failing, I got a long hex key and made it "really tight." That still didn't work so I tried 16 newton meters using a torque wrench.

That seems fine so far, but I fear getting uncomfortable on a long ride or over compensating on adjustment (my right knee where I had a tibial nail installed is very sensitive to saddle height) and am going to upgrade to a $110 (used) Campagnolo Record SP-10RE seatpost with a clamp mechanism identical to my C-Record aero post, but round all the way up so I can insert it far enough into my frame with the newer version of my saddle that sits higher above its rails.