The Handlebar Seatpost Mount is a seatpost and handlebar tube clamp for mounting your quick-release GoPro camera on to tubes/frames ranging from 0.75" to 1.4" (1.9cm - 3.5cm) in diameter.
You can also clamp to chainstays, small roll bars, bolt-heads, windsurfing and kitesurfing booms/control bars, or anything else that is within its size range.
Compatible with all GoPro Quick-Release Housing for Standard, Wide, and HD models. NOT compatible with GoPro Wrist Housings.
-  Handlebar/Seatpost Clamp
-  Three-way Adjustable Pivot Arm (three piece assembly)
- Warranty: One Year
- Construction: polycarbonate
- Hardware: stainless steel nuts and bolts
- Clamp Diameter: 0.75" to 1.4" (19mm - 35.5mm)
Good but not Great Review by BleepyEvans
Its a nice camera mount, but some some sort of rubber needs to be included as without the mount isnt as tight as wanted on smooth surfaces and could possibily move and wobble when going over bumps. A piece of inner tube from a bike seems to be the way forward, but some small pieces of sticky back rubber can be purchased :) (Posted on 11-04-19)