Descriptions:Due to its small friction, the ball screw is the most commonly usedtransmission element in tool mechanics and precision mechanics. Its mainfunction is to convert rotational motion into linear motion with high accuracy,reversibility and high efficiency.Features:1. Made of bearing steel, wearproof, anti-corrosion, rustproof anddurable.2. Low noise while running due to its small friction.3. With high accuracy, reversibility and high efficiency.4. Easy and quick to install without much effort.5. Fit for RM1605, SFU1605 Ball ScrewSpecifications:Material: GCr15 Bearing SteelModel: SFU1605Quantity: 2pcsHole Diameter: 16mm/0.63inSize(L*W): 8*4.7cm/3.15*1.85inWeight: Approx. 178gPackage Includes:1 x Ball Nut1 x Ball Screw RodNote:Please allow 1-3mm error due to the manual measurement. Thanksfor your understanding..