The TOPCLIMBER is the only solo mast climbing system that allows the operator to work ABOVE the masthead without leaving the chair and to go to any place above the deck. The operator can climb the mast safely and quickly using mainly leg muscles without any assistance from others. Also an ability to reach the stays by simply attaching the static line on the rail. Easy to install and simple to use. Climb 50-70cms per jammer movement. Tested up to 600kg it is 20% stronger than any approved mountaineering device. It’s impossible to release both of the one way jammers at the same time.