The Drift Handlebar Mount Kit for HD170 / X170 Cameras is a quick-release mounting kit for attaching a Drift HD170 or X170 action cam to a bicycle or motorcycle handlebar or to a pole with a similar diameter (around 1").
The clamping piece tightens to the handlebar via a thumbscrew. The camera plate attaches to the camera via a 1/4"-20 screw and to the clamp via a quick-release connection, allowing you to quickly and easily remove the camera with its plate attached and re-attach it to a Drift Helmet Mount, for instance.
The Drift HD170 and X170 both come with a Handlebar Mount Kit; this is a replacement kit. The Handlebar Mount Kit is designed specifically to mount the HD170/X170, but its standard 1/4"-20 screw will fit the tripod thread of many other camcorders.