Versatile 15cm 5. 9 friction arm kit with Anti-rotation attachment on one end attachment on the other end & Nano Clamp 386B-1 included. The Anti-rotation system is compatible with Manfrotto products 055 series 190 series & 386B-1 Nano Clamp. The unique shape of the Anti-rotation adapter allow the equipment to be securely interlocked so the arm will not rotate anymore. Attachments can easily be replaced by using the included hex key & are compatible with a range of different adapters. Please note that the arm measurements do not include the length of the adapters