Features 1、Made of bearing steel, wearproof, anti-corrosion, rustproof and durable. 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 Screw Specification Descriptions: Due to its small friction, the ball screw is the most commonly used transmission element in tool mechanics and precision mechanics. Its main function 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 and durable. 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 Screw Specifications: Material: GCr15 Bearing Steel Model: SFU1605 Quantity: 2pcs Hole Diameter: 16mm/0.63in Size(L*W): 8*4.7cm/3.15*1.85in Weight: Approx. 178g Package Includes: 1 x Ball Nut 1 x Ball Screw Rod Note: Please allow 1-3mm error due to the manual measurement. Thanks for your understanding. Package List