BK12 + BF12 Ballscrew Support Set - Fixed + Floating SupportsBK12 + BF12 Ballscrew Support Set Fixed + Floating Supports Fits SFU1605 SFU1610 This BK12 + BF12 support set is designed for use with SFU1605 and SFU1610 ball screws, offering stable and accurate performance in CNC machines and linear motion systems. The BK12 block serves as the fixed support with preloaded bearings, while the BF12 acts as the floating end to handle thermal expansion and maintain smooth motion. Includes: 1 BK12 (fixed end) + 1 BF12