FK-FF 25WERB FK FF 25 Shaft Support Set Fixed and Floating Supports for 25 mm CNC Ball Screw The WERB FK FF 25 shaft support set combines a fixed FK block and a floating FF block for 25 mm CNC ball screws, giving a complete support solution for medium size CNC and automation axes. The fixed end locates the screw axially, while the floating end supports the far side and allows for expansion, helping to keep motion smooth on machines across Pakistan. As the