Rowiz Black Bike Bicycle Quick Release Seatpost Seat Clamp Bolt for Road Bike Cycling, Black of 10

Not that durable and low quality material

Bolts are M5 not M6 like advertised

They were ordered NOT for a bike, but for an A-Frame gym. The sidebars holds the frame in a fixed position. I needed the quick release instead of the bolt and screw, for easy assembly and then easy disassembly, It works better than expected. Up or down in less than 60 seconds.

I have installed these on a total of 5 bikes with great success. Once you get the pressure dialed in these hold the seat in place wonderfully. My kids can now easily adjust seat heights. I tested the clamping force and once tightened the seats can hold over 200 Lbs no problem. If you look at my photos you can see I installed these on different stem styles and they all worked.

I feel like I'm constantly having to adjust seat heights on my kids bikes and this makes it quick and easy