One of these kits is required for each heliocol solar collector. It contains the parts necessary to connect the collectors together and mount them on the installation surface. This kit features the alligator clamp mounting system, which is the latest and most stable way to attach the heliocol solar panel to the roof. It also features the panel clamp assembly which is a durable, specially-engineered clamp that never requires replacement and never needs to be tightened.