A camstrap is a piece of webbing with a buckle that is used to secure a cylinder or scuba tank to a buoyancy compensator or backplate. The name is derived from the cam action of the buckle to tighten and secure the strap. Also known as a cam band or tank strap. Cam straps are also typically used in whitewater rafting to tie rowing frames to the rafts. However, the cam buckle used in rafting cam straps is very different from one used in diving. The rafting cam strap has a self-locking cam lever that cannot be accidentally released. A thumb released cam locks the webbing in place and its locking action even allows tightening one handed.