Operating elements Pi – The new Pi range of operating elements from item includes knurled, wing and three-arm knobs, handles and clamping levers that slot seamlessly into the item building kit systems. All the elements combine a clear, uniform design language with exceptional ergonomics. They are shaped for comfort and designed to minimize the amount of force users need to apply. Each element is available in three sizes and two color options, making the range highly versatile and ideal for a broad range of applications.