The Dlc Handlebar/Seat Post Pole Mount For Go Pro Cameras Allows All The Current Gopro Cameras On The Market Today To Be Mounted On To A Handlebar Or Seat Post. The Maximum Post Size Is 1-5/8" (4Cm). Included Is 1 Short And 1 Long Extension Arm As Well As 1 Short And 1 Long Locking Screw.