STIHL CARBON FIBRE EXTENSION SHAFTSTIHL CARBON FIBRE EXTENSION SHAFT With the STIHL carbon shaft extension, you can quickly and easily increase your working radius with a KombiTool by 100 cm. When maintaining hedges or trees, hard to access areas require additional reach. Carbon is characterised by its light weight of just 0. 9 kg, combined with high rigidity and stability. This prevents the carbon shaft extension from bending even if it comes into frequent contact with hard branches