Multi Flex is more than a tool. It s the indispensable tool. It s more than a bracing height and tiller gauge. MultiFlex is a sturdy tool that can be used like a wrench for most types of nocks, a wrench for 2, 3 or 4 blades broadheads. The three bladed wrench can be used for checking the correct fletching position of arrows with three vanes. MultiFlex is made with a very strong light-weight poly-carbonate material.