The Box One Quick Release Seat Clamp will keep your seat exactly where you want it. It comes in 31.8mm or 34.9mm to fit the most common seat tube sizes. Built out of aluminum and using titanium hardware, this necessary component won't add hardly any weight at all.
Material: 6061-T6 Aluminum, Titanium Hardware
Size: 31.8mm or 34.9mm
Weight: 27 grams (for the 31.8mm)